Okland F., 1932: Norske „halvinsekter“ (Protura). 7 pp.
 
ARA 1887
Okland J., 1964: Om utbredelsen av vannskorpionen (Nepy cinerea L.) i Norge. 7 pp.
 
AEP 11135
Okunev P., 1933: Noví ruští tesaříci (Col. Ceramb.). 2 pp. Acta entomologica Musei nationalis Pragae 11: 135-136.
 
FEH 461137
Oláh J., 1985: Three new Trichoptera from Korea. 6 pp. [TRI 143] Folia Entomologica Hungarica (S.N.) 46(1): 137-142.
 
FEH 47141
Oláh J., 1986: Four new Trichopterqa from Tanzania. 7 pp. [TRI 145] Folia Entomologica Hungarica (S.N.)47: 141-147.
 
FEH 48151
Oláh J., 1987: Record of Smicridea jamaicensis Flint from Cuba (Trichoptera: Hydropsychidae). 2 pp. Folia Entomologica Hungarica (S.N.) 48: 151-152.
 
FEH 49157
Oláh J., 1988: Eight new Agapetus from Vietnam (Trichoptera, Glossosomatidae). 10 pp. [TRI 148] Folia Entomologica Hungarica (S.N.) 49: 157-166.
 
FEH 54093
Oláh J., 1993: Seven new Trichoptera from the Gombak River system, Malaysia. 8 pp. [TRI 149] Folia Entomologica Hungarica (S.N.) 54: 93-100.
 
95522
Oldekop E., 1930: Über das Hierarchische Prinzip in der Natur und seine Beziehungen zum Mechanismus-Vitalismus-Problem. 64 pp. (in German).
 
DIP 4442
Oldenberg L., 1901: Blepahrocera fasciata Westw. (Dipt.). 8 pp.
 
DIP 2463
Oldenberg L., 1916: Einige Dolichopodiden meiner Ausbeute (Dipt.). 12 pp.
 
DIP 2464
Oldenberg L., 1924: Zur Kenntnis der Asiliden-Gattung Lasiopogon (Diptera). 8 pp. [M15] [M40]
 
DIP 2465
Oldenberg L., 1927: Anthomyza fasciipennis sp. n. (Dipt.). 3 pp.
 
63624
Oldroyd H., 1937: Bombyliidae from Chile and Western Argentine (Part II). 11 pp.
 
DIP 5783
Oldroyd H., 1949: Diptera. Introduction, and keys to families. 4 pp.
 
DIP 7068
Oldroyd H., 1960: Diptera Asilidae. Mission zoologique de l’I.R.S.A.C. en Afrique orientale. (P. Basilewsky et N. Leleupt, 1957). XXIX. 5 pp.
 
DIP 7069
Oldroyd H., 1960: Some Tabanidae (Dipt.) from Madagascar. 6 pp. [M42]
 
DIP 7070
Oldroyd H., 1961: Ergebnisse der Deutschen Afghanistan-Expedition 1956 der Landessammlungen für Naturkunde Karlsruhe. 4 pp.
 
DIP 6881
Oldroyd H., 1963: The 3rd Danish Expedition to Central Asia. Zoological results 32. Asilidae (Insecta) from Afghanistan. 5 pp. [M42]
 
DIP 2473
Oldroyd H., 1966: Notes on Coenomyia Latreille (Diptera: Coenomyiidae). 10 Figs., 11 pp. [B18]
 
BTE 16953
Oldroyd H., 1966: Notes on Coenomyia Latreille (Diptera: Coenomyiidae). 10 Figs., 11 pp. [DIP 2473] [B18] [M15]
 
INS 748
Oldroyd H., 1966: The future of taxonomic entomology. 8 pp.
 
63626
Oldroyd H., 1968: New Therevidae from Argentina. 9 pp.
 
DIP 7071
Oldroyd H., 1972: Asilidae (Diptera) d’Espagne (Pyrénées et Montes Universales). 4 pp. [M42]
 
DIP 2479
Olejníček J., 1982: Příspěvek k poznání druhů rodu Medetera (Diptera, Dolichopodidae) v ČSSR. 3 pp. [ZCS 18041] [M40]
 
KLA 32129
Olejníček J., Barták M., 1996: Faunistic records from the Czech Republic – 41 Diptera: Dolichopodidae. 2 pp. [M50] Klapalekiana 32(1-2): 129-130.
 
EPR 28127
Olejníček J., Kozánek M., 1997: Systenus slovaki sp. nov. (Diptera, Dolichopodidae) from Korea. 3 pp. Entomological Problems 28(2): 127-129.
 
KLA 32200
Olejníček J., Mocek B., 1996: Faunistic records from the Czech Republic – 47. Diptera: Dolichpodidae. 1 pp. [M54] Klapalekiana 32(3-4): 200.
 
DIP 2485
Olejníček J., Rozkošný R., 1978: Some species of Dolichopodidae (Diptera) new to the fauna of Czechoslovakia. 9 pp.
 
ASC 47052
Olexa A., 1950: Vzácnější druhy brouků z východního Slovenska. 4 pp. [COL721] [B18] [M34] Acta Societatis entomologicae Cechosloveniae 47: 52-55.
 
BSM 05832
Olexa A., 1958: Abraeus roubali n. sp., (Col. Histeridae). 1 pp. [HIS 64] [M23] Bulletin de la Société entomologique de Mulhouse 11(3): 32-35.
 
REP 175
Olexa A., 1962: Über die Haltung des Bunten Zwergchamäleons Microsaurus pumilus Daud. 9 pp. (in German). [M52] Aquarien und Terrarien: 33-41.
 
19392
Olexa A., 1975: Reklassifikation der Gattung Dirhagus und verwandter Gattungen (Coleoptera – Eucnemidae). 10 pp. [M63]
 
BSM 07521
Olexa A., 1975: Sur la variabilité de Saprinus perrisi Marseul, 1871 (Col. Histeridae). 1 pp. (in French). [M52] Bulletin de la Société entomologique de Mulhouse 8: 21.
 
AEB 73416
Olexa A., 1976: Anophtaeletes rousi gen. n., sp. n. aus dem Kaukasus (Coleoptera, Histeridae). 4 pp. [HIS 65] [M19] [M46] Acta Entomologica Bohemoslovaca 73: 416-419.
 
ELA 390
Olexa A., 1976: Beschreibung des Männchens vom Dirhagus palmi Olexa (Coleoptera, Eucnemidae). 4 pp. [M42]
 
AEB 77252
Olexa A., 1980: Eine neue Gattung und Art der psammophilen Histeridae aus der Karakum-Wüste (Coleoptera). 6 pp. [HIS 66] [M19] Acta Entomologica Bohemoslovaca 77: 252-257.
 
AEB 79196
Olexa A., 1982: Atholus (Euatholus) khnzoriani sp. n. aus Armenien, nebst Bemerkungen zur Systematik und Bionomie der Histerini (Coleoptera: Histeridae). 11 pp. [14189] [B05] [B14] Acta Entomologica Bohemoslovaca
 
AEB 79037
Olexa A., 1982: Revision der palaärktischen Arten der Gattung Anapleus (Coleoptera: Histeridae). 9 pp. [M34] Acta Entomologica Bohemoslovaca 79: 37-45.
 
AEB 81377
Olexa A., 1984: Hypocacculus (Nessus) neftensis sp. n. (Coleoptera, Histeridae). 3 pp. [HIS 67] [M19] Acta Entomologica Bohemoslovaca 81: 377-379.
 
AEB 81113
Olexa A., 1984: Revision der Arten der Gattung Pholioxenus Reichardt (Coleoptera: Histeridae). 19 pp. [B14] Acta Entomologica Bohemoslovaca
 
AEB 84216
Olexa A., 1987: Atholus astragali sp. n. aus Armenien, UdSSR (Coleoptera, Histeridae). 6 pp. [HIS 68] [M19] Acta Entomologica Bohemoslovaca 84: 216-220.
 
AEB 85469
Olexa A., 1988: Atholus holzschuhi sp. n. aus Nordiran (Coleoptera, Histeridae). 4 pp. [HIS 69] [M19] Acta Entomologica Bohemoslovaca 85: 469-472.
 
AEB 86309
Olexa A., 1989: Eutriptus punctatostriatus sp. n. aus Nepal (Coleoptera, Histeridae). 2 pp. [M46] Acta entomologica Bohemoslovaca 86: 309-310.
 
AEB 87141
Olexa A., 1990: On the genus Philothis and related genera (Coleoptera, Histeridae). 15 pp. [B14] [M32] Acta Entomologica Bohemoslovaca 87: 141-155.
 
RCB 29045
Olexa A., 1992: Bemerkungen zu einigen Arten der Gattung Gnathoncus Jacq. du Val, 1858 (Insecta, Coleoptera: Histeridae). 6 pp. [HIS 172] [M24] Reichenbachia 29/8: 45-50.
 
HIS 173
Olexa A., 1992: Bemerkungen zur Taxonomie, Bionomie und Verbreitung einiger Histeriden-Arten (Insecta, Coleoptera: Histeridae). 5 pp. [M20]
 
FHA 01007
Olexa A., 1992: Neue Art der Gattung Saprinus (Coleoptera: Histeridae). 3 pp. [M09]
 
FHA 02027
Olexa A., 1994: Bemerkungen zur Systematik der Gattung Pholioxenus (Coleoptera: Histeridae). 5 pp. [M09]
 
AGR 52
Oliveira A. N., Oliveira L. A., Figueiredo A. F., 2003: Arbuscular mycorrhizal colonization and nutrient concentration of three cultivars of banana on a Central Amazonian Oxisol. 8 pp. Acta Amazonica 33(3): 345-352.