Geodesic
On the deficiency index of second-order matrix differential operators
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2000), pp. 62-67.

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V. P. Serebryakov. On the deficiency index of second-order matrix differential operators. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (2000), pp. 62-67. https://geodesic-test.mathdoc.fr/item/IVM_2000_5_a8/

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