Biermann, Ludwig Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;
Biermann, L. (1977). Historical reminiscences of the origins of stellar convection theory (1930 - 1945). In E. A. Spiegel, & J. P. Zahn (Eds.), Problems of Stellar Convection: Proceedings of the Colloquium Nr. 38 of the International Astronomical Union (pp. 4-14). Berlin [u.a.]: Springer.