Hongxing Rui An Alternative Direction Iterative Method with Second-Order Upwind Scheme for Convection-Diffusion Equations. 527-533 2003 80 Int. J. Comput. Math. 4 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0020-7160&volume=80&issue=4&spage=527 db/journals/ijcm/ijcm80.html#Rui03