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Translated from Sibirskii Matematicheskii Zhurnal. Vol. 10, No. 6, pp. 1422–1426, November–December, 1969.
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Nagnibida, N.I. On the equivalence of certain first order differential operators with “singularities”. Sib Math J 10, 1056–1058 (1969). https://doi.org/10.1007/BF00990781
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DOI: https://doi.org/10.1007/BF00990781