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Cytology of oocytes in ground squirrels (Citellus citellus L.)Tsvetan Tsvetkov; Tsvetanka Takeva · 1989
The ovarium of the hibernator (Citellus citellus L.) after spring arousalTsvetan Tsvetkov; Tsvetanka Takeva · 1989
Seasonal changes of the ovarian atretic follicles of the ground squirrel (Citellus citellus L.)Tsvetan Tsvetkov; Tsvetanka Takeva · 1989
Some seasonal changes in the thecal gland in the ovaries of hibernators (Citellus citellus L.)Tsvetan Tsvetkov; Tsvetanka Takeva · 1991
Histoenzymatic activity of the Δ5-3β-hydroxysteroid dehydrogenase of ovary in hibernators (Citellus citellus L)Tsvetan Tsvetkov; Tsvetanka Takeva · 1988
Changes in interstitial gland in the ovary of the bat Rinolaphus eurale Blas: Arousal from hibernationTsvetan Tsvetkov; Tsvetanka Takeva · 1988