Handbook of recursive mathematics / ed. by Yu.L. Ershov ... [et al.] ; associate ed. V.W. MarekHandbook of recursive mathematics / Yu.L. ErshovHandbook of recursive mathematics / Yu.L. ErshovHandbook of recursive mathematics / ed. by Yu.L. Ershov ... [et al.] ; associate ed. V.W. MarekHandbook of recursive mathematics / Yu.L. ErshovHandbook of recursive mathematics / Yu.L. Ershov