Kolev, Z., 2005a: Notes on the distribution and ecology of Balkan populations of the Plebeius idas group (Lepidoptera: Lycaenidae). Phegea 33: 1322.

Kolev, Z., 2005b: New data on the taxonomic status and distribution of Polyommatus andronicus Coutsis & Ghavalas, 1995 (Lycaenidae). Nota lepidopterologica 28: 3548.

Kolev, Z., 2005c: Polyommatus dantchenkoi (Lukhtanov & Wiemers, 2003) tentatively identified as new to Europe, with a description of a new taxon from the Balkan Peninsula (Lycaenidae). Nota lepidopterologica 28: 2534.

Kolev, Z., 2004: On the distribution, ecology and conservation status of two little-known Bulgarian butterflies: Brenthis ino (Rottemburg, 1775) and Kirinia climene (Esper, [1783]) (Lepidoptera: Nymphalidae). Linneana belgica XIX (4): 165172.

Kolev, Z., 2003a: First record of Muschampia cribrellum in Bulgaria, with a review of the recorded distribution of genus Muschampia in the country (Lepidoptera: Hesperiidae). Phegea 31 (1): 1521.

Kolev, Z., 2003b: Book review: Kudrna, O., 2002, The Distribution Atlas of European Butterflies. Nota lepidopterologica 25 (4): 280283.

Kolev, Z., 2003c: A final note on the taxon Aricia (Ultraaricia) orpheus and its relationship to Plebeius (Aricia) anteros (Lepidoptera: Lycaenidae). Phegea 31 (4): 161166.

Kolev, Z., 2002a: Critical notes on some recent butterfly records (Lepidoptera: Papilionoidea & Hesperioidea) from Bulgaria and their source collection. Phegea 30 (3): 95101.

Kolev, Z., 2002b. The species of Maculinea van Eecke, 1915 in Bulgaria: distribution, state of knowledge and conservation status (Lycaenidae). Nota lepidopterologica 25 (2/3): 177190.

Kolev, Z. & Kullberg, J., 2000: Cupido alcetas (Hoffmansegg, 1804), a new bluewing species to Finland with comments on its distribution in Europe. Baptria 25 (4): 157162. (in Finnish, English summary)

Balletto, E., Boomsma, J.J., Centre Suisse de Cartographie de la Faune, van Dyck, H., Fiedler, K., Figurny, E., Gadeberg, R.M.E., Goffart, P., LHonore, J., Kolev, Z., Maes, D., Richard, A., Settele, J., Stadel Nielsen, P. & Wynhoff, I. [compiled by Munguira, M. & Martín, J.], 1999. Action plan for Maculinea butterflies in Europe. Nature and environment, No. 97. Council of Europe Publishing, Strasbourg Cedex, 64 pp.

Kolev, Z., 1998: Maculinea arion (L.) in Finland distribution, state of knowledge and conservation. Journal of Insect Conservation 2: 9193.

Kolev, Z. & van der Poorten, D., 1997: Review of the distribution of the Balkan endemic Polyommatus (Agrodiaetus) aroaniensis (Lepidoptera: Lycaenidae). Phegea 25 (1): 3540.

Beshkov, S. & Kolev, Z., 1996: A new Chersotis Boisduval, 1840 species for the Bulgarian fauna and a second record of its closely related species from Bulgaria with a review of their nomenclature (Lepidoptera: Noctuidae: Noctuinae). Esperiana Buchreihe zur Entomologie 4: 98-102.

Kolev, Z. & De Prins, W., 1995: A new species of the brown Agrodiaetus complex from the Crimea (Lepidoptera: Lycaenidae). Phegea 23 (2): 119-132.

Kolev, Z., 1994a: Two Polyommatus (Agrodiaetus) species new to Bulgaria [P. aroaniensis P. nephohiptamenos], with notes on the related Bulgarian taxa (Lepidoptera: Lycaenidae). Phegea 22 (2): 61-71.

Kolev, Z., 1994b: Euchloe penia (Freyer, 1852) from SW Bulgaria (Lepidoptera: Pieridae). Phegea 22 (3): 81-83.

Kolev, Z., 1994c: Spialia phlomidis (Herrich-Schäffer, 1845) confirmed for Bulgaria. Phegea 22 (4): 151-155.

Kolev, Z.,1993: Records of new [and] rare Noctuidae (Lepidoptera) from Rhodopi and Rila mountains in South Bulgaria. Proceedings of the Second National Entomological Conference, Sofia (1993): 43-45.