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A. Chudov,"Finite-difference schemes and ill-posed problems for partial differential equations," in: Computational Methods and Programming [in Russian], No. 8, Moskov. , Moscow (1967), pp. 34-62. 199. V. F. Sholokhovich, "Unstable extremal problems," Matem. Zap. Ural'sk. , i, No. 2, 103-111 (1969). 200. V. F. Sholokhovich. "Unstable extremal problems and the geometric properties of Banach spaces," Dokl. Akad. Nauk SSSR, 19__5, No. 2, 289-291 (1970). 201. V. F. Sholokhovich, "Approximate solution of unstable extremal problems," Izv.

Sci. Math. , 6, Nos. 3-4, 457-465 (1971). 224. P. Medgyessy, "Inkirrekt matematikai probl~m~k vizsg~lat~nak jelen ~ll~s~r61 u~IbnBs tekintettel. I. Faj6 oper~toregyenletek megold~s~ra," Magy. Tud. Akad. Mat. ~s Fiz. Tud. Oszt. , 20, Nos. 1-2, 97-131 (1971). 225. K. Miller, "Three circle theorems in partial differential equations and applications to improperly posed problems," Arch. Rational Mech. , 16, No. 2, 126-154 (1964). 226. I. P. Nedyalkov, "An approach in the theory of incorrect problems," Dokl.

Pure Appl. , 8, 591-594 (1955). 221. F. John, "Continuous dependence on data for solutions with a prescribed bound," Commun. Pure Appl. , 13, No. 4, 551-585 (1960). 222. F. John, "Numerical solution of problems which are not well posed in the sense of Hadamard," in: Sympos. Numerical Treatment of Partial Differential Equations with Real Characteristics, Rome (1959), pp. 103-116. 223. K. Marton and L. Varga, "Regularization of certain operator equations by filters," Stud. Sci. Math. , 6, Nos. 3-4, 457-465 (1971).

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