K. R. Raslan A computational method for the equal width equation. 63-72 2004 81 Int. J. Comput. Math. 1 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0020-7160&volume=81&issue=1&spage=63 db/journals/ijcm/ijcm81.html#Raslan04