A priori parameter explicit bounds on the derivatives of the solution of a two parameter singularly perturbed elliptic problem in two space dimensions are presented. These bounds are used to establish parameter uniform error bounds for a numerical method consisting of upwinding on a tensor product of two piecewise uniform meshes.
O’Riordan, E., Pickett, M. L., & Shishkin, G. I. (2006). Numerical methods for singularly perturbed elliptic problems containing two perturbation parameters. Mathematical Modelling and Analysis, 11(2), 199-212. https://doi.org/10.3846/13926292.2006.9637313
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