Recent Progress in obstetrics and gynaecology : proceedings of the 7th World congress of obstetrics and gynaecology held in Moscow, August 12-18, 1973 - Persianinov, Leonid Semenovič; Chervakova, T. V.; Presl, Jiří, 1926-2003. (Amsterdam : Excerpta Medica ; Praha : Avicenum, 1974)