1. Brondsted, H. V.: The existence of a static potential and graded regeneration field in planarians. Biol. Medd. danske Vidensk. Selsk.20, No 4, 1?31 (1946).
2. ?: Experiments on the time-graded regeneration field in planarians. (With a discussion of its morphogenetic significance.) Biol. Medd. danske Vidensk. Selsk.23, No 3, 1?39 (1956).
3. ?, andAgnes BrØndsted: Size of fragment and rate of regeneration in planarians. J. Embryol. exp. Morph.2, part 1, 49?54 (1954).
4. Dubois, F.: Contribution à l'étude de la migration des cellules de régénération chez les planaires dulcicoles. Bull. biol. France et Belg.83, 213 (1949).
5. Kühn, A.: Entwicklungsphysiologie, 2. Aufl. Berlin-Heidelberg-New York: Springer 1965.