1. Dorso-ventral ectodermal compartments and origin of apical ectodermal ridge in developing chick limb;Altabef;Development,1997
2. Riceherche sperimentali sulla morfogenesi degli arti nel pollo;Amprino;J. Exp. Zool.,1955
3. Spatio-temoral distribution of a zone that controls antero-posterior polarity in the limb bud of the chick and other bird embryos;Balcuns;Am. Zool.,1970
4. An Introduction to Embryology;Balinsky,1965
5. Limb development in the absence of ectodermal ridge;Bell;Nature,1959