Media type: E-Article Title: Comments Contributor: Clube, S.V.M. Published: Cambridge University Press (CUP), 1983 Published in: Highlights of Astronomy, 6 (1983), Seite 225-225 Language: English DOI: 10.1017/s1539299600005189 ISSN: 1539-2996 Keywords: General Engineering Origination: Footnote: Access State: Open Access