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R. J. Knops "Review: M. M. Lavrent′ev, V. G. Romanov and S. P. Shishatskiĭ, Ill-posed problems of mathematical physics and analysis," Bulletin (New Series) of the American Mathematical Society, Bull. Amer. Math. Soc. (N.S.) 19(1), 332-337, (July 1988)