Keller, R (1981). "An Experimental Analysis of the Role of Bottle Cells and the Deep Marginal Zone in Gastrulation". The Journal of Experimental Zoology. 216 (1): 81–101. doi:10.1002/jez.1402160109. PMID7288390.
Keller, R (1981). "An Experimental Analysis of the Role of Bottle Cells and the Deep Marginal Zone in Gastrulation". The Journal of Experimental Zoology. 216 (1): 81–101. doi:10.1002/jez.1402160109. PMID7288390.