P. E. K. K. A.  VILKAMAA and Hippa, H., ?Review of the Nearctic Claustropyga Hippa, Vilkamaa & Mohrig (Diptera, Sciaridae) with the description of three new species?, Zootaxa, vol. 1552, pp. 53?68, 2007.

P. E. K. K. A.  VILKAMAA and Hippa, H., ?Phylogeny of Peyerimhoffia Kieffer, with the revision of the species (Diptera: Sciaridae).?, Insect Systematics & Evolution, vol. 35, no. 4, pp. 457-480, 2005.

K.  Heller, VILKAMAA, P. E. K. K. A., and Hippa, H., ?An annotated check list of Swedish black fungus gnats (Diptera, Sciaridae)?, Sahlbergia, vol. 15, no. 1, pp. 23-51, 2009.

P. E. K. K. A.  VILKAMAA and Hippa, H., ?Phylogeny of Peyerimhoffia Kieffer, with the revision of the species (Diptera: Sciaridae)?, Insect Systematics & Evolution , vol. 35, no. 4, pp. 457?480, 2005.

P. E. K. K. A.  VILKAMAA, Hippa, H., and MOHRIG, W., ?The genus Sciara Meigen (Diptera, Sciaridae) in New Caledonia, with the description of two new species?, Zootaxa , vol. 3974 , no. 4, pp. 589?594, 2015.

W.  MOHRIG, Heller, K., Hippa, H., VILKAMAA, P. E. K. K. A., and Menzel, F., ?Revision of the Black Fungus Gnats (Diptera: Sciaridae) of North America?, Studia dipterologica, vol. 19, no. 1/2, pp. 141?286, 2012.

P. E. K. K. A.  VILKAMAA, Hippa, H., and Taylor, S. J., ?The genus Camptochaeta in Nearctic caves, with the description of C. prolixa sp. n. (Diptera, Sciaridae)?, ZooKeys, vol. 135, pp. 69?75, 2011.

P. E. K. K. A.  VILKAMAA and Hippa, H., ?Corynoptera vagula Tuomikoski and allied species (Diptera: Sciaridae)?, Zootaxa, vol. 1150, pp. 31?42, 2006.

P. E. K. K. A.  VILKAMAA, Hippa, H., and Heller, K., ?Review of the genus Camptochaeta Hippa & Vilkamaa (Diptera, Sciaridae), with the description of nine new species?, Zootaxa, vol. 3636, no. 3, pp. 476-488, 2013.

K.  Heller, Hippa, H., and VILKAMAA, P. E. K. K. A., ?Taxonomy of Bradysia Winnertz (Diptera, Sciaridae) in the Northern Holarctic, with the description of four new species?, European Journal of Taxonomy, vol. 122, pp.  1?15, 2015.

H.  Hippa and VILKAMAA, P. E. K. K. A., ?New species and records of Keilbachia Mohrig (Diptera, Sciaridae) from the Oriental region?, Zootaxa, vol. 1622, pp. 57?68, 2007.

P. E. K. K. A.  VILKAMAA, Menzel, F., and Hippa, H., ?Review of the genus Keilbachia Mohrig (Diptera: Sciaridae), with the description of eleven new species?, Zootaxa, vol. 2272, pp. 1?20, 2009.

P. E. K. K. A.  VILKAMAA, Hippa, H., and MOHRIG, W., ?The genus Ctenosciara Tuomikoski (Diptera, Sciaridae) in New Caledonia, with the description of eight new species?, Zootaxa, vol. 3255, pp. 37?51, 2012.

P. E. K. K. A.  VILKAMAA, Hippa, H., and MOHRIG, W., ?The genus Bradysia Winnertz (Diptera, Sciaridae) in New Caledonia, with the description of thirteen new species?, Zootaxa, vol. 3489, pp. 25?44, 2012.

P. E. K. K. A.  VILKAMAA and Hippa, H., ?The genus Xenosciara gen. n. and the phylogeny of the Sciaridae (Diptera)?, Zootaxa, vol. 699, pp. 1?24, 2004.

P. E. K. K. A.  VILKAMAA, Komarova, L. A., and Hippa, H., ?The genus Keilbachia Mohrig (Diptera, Sciaridae) in a biodiversity hot spot new sympatric species from Kambaiti, Burma?, Zootaxa, vol. 1123, pp. 39?55, 2006.

P. E. K. K. A.  VILKAMAA, Hippa, H., and Komarova, L. A., ?The genus Dichopygina gen.n. (Diptera, Sciaridae)?, Insect Systematics and Evolution, vol. 35, no. 1, pp. 107-120, 2004.

P. E. K. K. A.  VILKAMAA, Salmela, J., and Hippa, H., ?Black fungus-gnats in deciduous forest habitat in northern Europe, with the description of Bradysia arcula sp. n. (Diptera: Sciaridae)?,  Entomologica Fennica, vol. 18, 2007.

H.  Hippa, ?Phylogeny of the Sciaroidea (Diptera): the implication of additional taxa and character data?, Zootaxa, vol. 1132, pp. 63?68, 2006.

H.  Hippa, ?Recharacterization of Rhynchoheterotricha Freeman (Diptera, Sciaroidea), with description of R. chandleri sp. n. from South Africa?, Zootaxa, vol. 1167, pp. 61?68, 2006.

H.  Hippa, VILKAMAA, P. E. K. K. A., and Heller, K., Review of the Holarctic Corynoptera Winnertz, 1867, s. str. (Diptera, Sciaridae). 2010, pp. 1?197.

H.  Hippa and VILKAMAA, P. E. K. K. A., ?Cladistic analysis finds a placement for an enigmatic species, Peyerimhoffia sepei sp. n. (Diptera Sciaridae), with a note on its spermatophore?, Zootaxa, vol. 1044, pp. 49-55, 2005.