Mohan K. Kadalbajoo Ashish Awasthi A parameter uniform difference scheme for singularly perturbed parabolic problem in one space dimension. 42-60 2006 183 Applied Mathematics and Computation 1 http://dx.doi.org/10.1016/j.amc.2006.05.023 db/journals/amc/amc183.html#KadalbajooA06a