. . "Structure and seasonal variation of the male reproductive organs of Vipera berus '(L.)'" . . . . . . . . "Structure and seasonal variation of the male reproductive organs of Vipera berus <L.>" . . "Structure and sessonal variation of the male reproductive organs of Vipera berus (L.)" . . . . . . . . "Structure and seasonal variation of the male reproductive organs of Vipera berus (L.), &c"@en . . . . "Structure and seasonal variation of the male reproductive organs of vipera Berus (L)" . . "Structure and seasonal variation of the male reproductive organs of vipera berus \"L\""@da . . . . . . . "Structure and seasonal variation of the male reproductive organs of vipera berus (L)"@en . "Structure and seasonal variation of the male reproductive organs of \"Vipera berus\" (L.)... [Thesis of the Faculty of mathematics and natural history of the University of Copenhagen.]" . . "Structure and seasonal variation of the male reproductive organs of Vipera berus (L.)" . "Structure and seasonal variation of the male reproductive organs of Vipera berus (L.)"@en . "organe reproducteur Vipera berus (Viperidae, Serpentes)" . . . .