Moreno, E. 1990: Form and function of the fibularis brevis muscle in some passerine birds. — Annales Zoologici Fennici 27: 3–9.
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Terhivuo, J. 1990: Relative regional abundance and colour morphs of the adder (Vipera berus L.), grass snake (Natrix natrix L.), slow worm (Anguis frasilis L.) and common toad (Bufo bufo L.) in Finland. — Annales Zoologici Fennici 27: 11–20.
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Voipio, P. 1990: The samson fox episode in Finland in the 1930s and 1940s, and the hypothetico-deductive method. — Annales Zoologici Fennici 27: 21–27.
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Väisänen, R. & Heliövaara, K. 1990: Morphological variation in Aradus cinnamomeus (Heteroptera, Aradidae): discrimination between parapatric alternate-year populations. — Annales Zoologici Fennici 27: 29–47.
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