ORIGIN AND ESTABLISHMENT OF EMBRYONIC POLAR AXES IN AMPHIBIAN DEVELOPMENT.NIEUWKOOP PD.1977; CURR. TOPICS DEVELOP. BIOL.; U.S.A.; DA. 1977; VOL. 11; PP. 115-132; BIBL. 1 P. 1/2Article

LA DETERMINATION ET LA MIGRATION DES CELLULES GERMINALES DANS LE REGNE ANIMALNIEUWKOOP PD.1982; ANNEE BIOL.; ISSN 0003-5017; FRA; DA. 1982; VOL. 21; NO 1; PP. 37-51; BIBL. 3 P.Article

NEURAL INDUCTION, A TWO-WAY PROCESSNIEUWKOOP PD; WEIJER CJ.1978; MED. BIOL.; FIN; DA. 1978; VOL. 56; NO 6; PP. 366-371; BIBL. 34 REF.Article

THE INDUCTION OF THE PRIMORDIAL GERM CELLS IN THE URODELESSUTASURJA LA; NIEUWKOOP PD.1974; ARCH. (WILHELM ROUX) ENTWICKL.-MECH. ORG.; DTSCH.; DA. 1974; VOL. 175; NO 3; PP. 199-220; BIBL. 1P.1/2Article

A DIFFUSION MODEL FOR MESODERM INDUCTION IN AMPHIBIAN EMBRYOS.WEYER CJ; NIEUWKOOP PD; LINDENMAYER A et al.1977; ACTA BIOTHEOR.; PAYS-BAS; DA. 1977; VOL. 26; NO 3; PP. 164-180; BIBL. 1 P. 1/2Article