Notas de Matemática - N° 014 http://www.saber.ula.ve/handle/123456789/4639 1978 2026-05-27T12:22:21Z Fixed rings of automorphisms of K [x,y]. http://www.saber.ula.ve/handle/123456789/22535 Fixed rings of automorphisms of K [x,y]. Markanda, Raj K. 2006-03-31T09:00:00Z Notas de Matemática http://www.saber.ula.ve/handle/123456789/22536 Notas de Matemática 2006-03-31T09:00:00Z