Free Download Computable functions… By N. K. Vereshchagin, A. Shen Publisher American Mathematical Society 2003 ISBN 0-8218-2732-4,9780821827321..

Free Download Basic set theory… By S. Shen, N. K. Vereshchagin Publisher American Mathematical Society 2002 ISBN 0-8218-2731-6,9780821827314 Series..