Cutland, Nigel. Computability : an introduction to recursive function theory / Nigel Cutland. - [1ยช ed., reimp.]. - Cambridge [etc.] : Cambridge University Press, 1980 ( - 251 p. ; 23 cm. ISBN: 0521-29465-7 Subjects--Topical Terms: Funciones computables Universal Decimal Class. No.: 621-52:519 519.6