Media type: E-Article Title: Some Notions of Reducibility and Productiveness Contributor: Lachlan, A. H. Published: Wiley, 1965 Published in: Mathematical Logic Quarterly, 11 (1965) 1, Seite 17-44 Language: English DOI: 10.1002/malq.19650110104 ISSN: 1521-3870; 0942-5616 Keywords: Logic Origination: Footnote: