Template:Ussov, 1885

• Ussov, M. (Усовъ, М.М.) 1885. Polypodium hydriforme. Новая форма прѣсноводныхъ цёлентератъ. Trudy Obshchestva Estestvoispytatelei pri Imperatorskom Kazanskom Universitete 14(6): 1–24, pl. 1–2. (Russian)  
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