http://www.saber.ula.ve/handle/123456789/4639 1978 Wed, 27 May 2026 14:22:09 GMT 2026-05-27T14:22:09Z http://www.saber.ula.ve/handle/123456789/22535 Fixed rings of automorphisms of K [x,y]. Markanda, Raj K. Fri, 31 Mar 2006 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22535 2006-03-31T09:00:00Z http://www.saber.ula.ve/handle/123456789/22536 Notas de Matemática Fri, 31 Mar 2006 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22536 2006-03-31T09:00:00Z