von Helmut Werner ; vollendet und herausgegeben von Felix Schmeidler = by Helmut Werner ; completed and edited by Felix SchmeidlerWissenschaftliche Verlagsgesellschaft1986
under supervision of Elena Toma and Maria TudorCentral Institute of Physics, Bucharest Astronomical Observatory, Center for Astronomy and Space Sciences, under the auspices of the Academy of S.R. Romania1982
under supervision of Ella Marcus and Ion RusuCentral Institute of Physics, Bucharest Astronomical Observatory, Center for Astronomy and Space Sciences, under the auspices of the Academy of S.R. Romania1979