Ansari, A. R., B. Hossain, B. Koren, and G. I. Shishkin. “Robust Numerical Methods for boundary‐layer Equations for a Model Problem of Flow over a Symmetric Curved Surface”. Mathematical Modelling and Analysis, vol. 11, no. 4, Dec. 2006, pp. 365-78, doi:10.3846/13926292.2006.9637324.