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M. S. Agranovich, “Singular elliptic integrodifferential operators,” Usp. Matem. Nauk,20, No, 5 (125) (1965).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 3, pp. 405–408, May–June, 1976.
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Lopatinskii, Y.B. Defect numbers of Fredholm operators. Ukr Math J 28, 315–317 (1976). https://doi.org/10.1007/BF01089185
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DOI: https://doi.org/10.1007/BF01089185