00565nam a2200217 a 4500 000030249 5288 20171030145630.0 171030s1995 LTT 511.61 BA-V Balakrishnan, V. K., 1931 Schaum's outline of theory and problems of combinatorics V. K. Balakrishnan, 1931. McGraw-Hill 1995 LTT From the UDN01 Monograph Printed language Mạng thư viện Đại học Đà Nẵng