Abstract
B. I. Ptashnik, Ill-Posed Boundary Value Problems for Partial Differential Equations [in Russian], Naukova Dumka, Kiev (1984). Yu. N. Valitskii, "A four-point problem for a differential equation in a Banach space," Funkts. Anal. Prilozhen., 15, No. 4, 69-70 (1981). Yu. N. Valitskii, "The conditional well-posedness of a four-point problem for a certain differential equation," in: Questions of Well-Posedness for Inverse Problems of Mathematical Physics [in Russian], Vychisl. Tsentr. Sibirsk. Otdel. Akad. Nauk SSSR, Novosibirsk (1982), pp. 45-49. Yu. N. Valitskii, "On the well-posedness of a multipoint problem for a differential equation with operator coefficients," Dokl. Akad. Nauk SSSR, 286, No. 5, 1041-1043 ( 1 9 8 6 ) .
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