1. Phase change in higher plants and somatic cell heredity;Brink;Quart. Rev. Biol.,1962
2. Forelesninger over nordisk plantegeografi (Textbook in Nordic plant geography);Dahl;Oslo, Norway,1952
3. Rejuvenation of Hedera helix in graft combinations;Doorenbos;Koninkl. Ned. Akad. Wetenschap. Proc. Ser. C,1954
4. Über Verjüngung bei Hedera helix L;Frank;Planta,1959
5. Transplanted nuclei and cell differentiation;Gurdon;Sci. Am.,1968