Stubbe, P. MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Becker, W., & Stubbe, P. (1963). Temperature variation in the F region during the last sunspot cycle. In Proc. Intern. Conf. Ion., London July 1962. The Institute of Pysics and the Physical Society London 1963 (pp. 35-42).
