Influence of DNA concentration on the efficiency of bovine blastocyst production after WAP-bGH microinjection into germinal vesicle of immature oocytes, zygotes andembryos obtained in vivo or in vitro - Jura, Jacek; Smorąg, Zdzisław; Kątska, Lucyna; Skrzyszowska, Maria; Houdebine, Louis-Marie; Ryńska, Bożenna (1997)