Aspassia Daskalopulu Costas S. Iliopoulos Manal Mohamed On-Line Analysis and Validation of Partially Occluded Images: Implementation and Practice. 1245-1257 2002 79 Int. J. Comput. Math. 12 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0020-7160&volume=79&issue=12&spage=1245 db/journals/ijcm/ijcm79.html#DaskalopuluIM02