By Pehlivanov B.   Mitkov M.   in The European Journal of Contraception and Reproductive Health Care

ISSN:1473-0782|12|1|30-35

Informa Healthcare‎(2007)‎

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By Malinova M.   Pehlivanov B.   in European Journal of Obstetrics & Gynecology and Reproductive Biology

ISSN:0028-2243|58|2|161-165

Elsevier‎(1995)‎

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