1. B. B. Gerdon, in: Intercellular Interaction in Differentiation and Growth [in Russian], Moscow (1970), pp. 102?117.
2. A. I. Zosimovskaya, Arkh. Anat. No. 11, 99 (1962).
3. V. B. Ivanov, in: Intercellular Interaction in Differentiation and Growth [in Russian], Moscow (1970), pp. 226?241.
4. T. A. Ivanova and A. A. Gordeeva, Probl. Gematol., No. 5, 52 (1976).
5. S. V. Kanaev, L. M. Rozanova, et al., Probl. Gematol., No. 9, 3 (1970).