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This research was supported by INTAS grant 93-0249-EXT.
Donetsk State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 33, No. 1, pp. 75–80, January–March, 1999.
Translated by M. M. Malamud
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Malamud, M.M. Borg type theorems for first-order systems on a finite interval. Funct Anal Its Appl 33, 64–68 (1999). https://doi.org/10.1007/BF02465147
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DOI: https://doi.org/10.1007/BF02465147