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Gerald J. Porter, Linear Algebra and Affine Planar Transformations, The College Mathematics Journal, Vol. 24, No. 1 (Jan., 1993), pp. 47-51 ...
Richard Sinkhorn, Linear Transformations Under Which the Doubly Stochastic Matrices are Invariant, Proceedings of the American Mathematical Society, Vol. 27, No. 2 (Feb., 1971), pp. 213-221 ...