G. M. Amiraliyev Mustafa Kudu Hakki Duru Uniform difference method for a parameterized singular perturbation problem. 89-100 2006 175 Applied Mathematics and Computation 1 http://dx.doi.org/10.1016/j.amc.2005.07.068 db/journals/amc/amc175.html#AmiraliyevKD06