Free Download Topology of real algebraic sets… By Selman Akbulut, Henry King Publisher Springer 1992 ISBN 1461397413,978-1-4613-9741-0,978-1-4613-9739-7,42-1992-516-3,29-1983-221-2,79-1985-589-6,66-1957-545-5..

Free Download Casson’s Invariant for Oriented Homology Three-Sph… By Selman Akbulut, John D. McCarthy Publisher Princeton University Press..