Johannes Müller: Einführung in die Konjunkturstatistik (Book Review) - Wald, A. (Periodicals Archive Online (PAO), 1936)
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4223-1936-007-03-000024
Keywords: Q