Ubbels GA, Hara K, Koster CH, Kirschner MW.  1983.  Evidence for a functional role of the cytoskeleton in determination of the dorsoventral axis in Xenopus laevis eggs.. J Embryol Exp Morphol. 77:15-37.

Gerhart J, Ubbels G, Black S, Hara K, Kirschner MW.  1981.  A reinvestigation of the role of the grey crescent in axis formation in xenopus laevis.. Nature. 292(5823):511-6.

Hara K, Tydeman P, Kirschner MW.  1980.  A cytoplasmic clock with the same period as the division cycle in Xenopus eggs.. Proc Natl Acad Sci U S A. 77(1):462-6.

Kirschner MW, Hara K.  1980.  A new method of local vital staining of amphibian embryos using ficoll and "crystals" of Nile Red.. Mikroskopie. 36(1-2):12-5.