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Adrianov, A. V., Malakhov, V. V. and Yushin, V. V. (1990). Fine structure of the cuticle of Pycnophyes kielensis (Kinorhyncha, Homalorhagida) (Tonkoe Stroenie Kutikuly Pycnophyes kielensis (Kinorhyncha, Homalorhagida)). Zoologicheskii Zhurnal. 69(1): 5-11.