Free Download Algorithms and Computation: 20th International Sym… By Ying Fei Dong, Ding-Zhu Du, Oscar H. Ibarra Publisher Springer 2009 ISBN 3642106307,978-3-642-10630-9..

Free Download Theory of computational complexity… By Ding-Zhu Du, Ker-I Ko Publisher Wiley 2014 ISBN 1118306082,978-1-118-30608-6 Series Wiley Series..