TY  - GEN
AU  - Nieuwkoop,P.D.
TI  - Activation and organization of the central nervous system in amphibians: Part I. Induction and activation, Part II. Differentiation and organization, Part III. Synthesis of a new working hypothesis 
PY  - 1952///
CY  - Philadelphia : 
PB  - Wistar Institute Press
N1  - Tav. di studio SZN
ER  -