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Moscow State Institute of Electronics and Mathematics. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 28, No. 3, pp. 1–21, July–September, 1994.
The research described in this publication was made possible in part by Grant No. N3H000 from the International Science Foundation.
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Agranovich, M.S. On series with respect to root vectors of operators associated with forms having symmetric principal part. Funct Anal Its Appl 28, 151–167 (1994). https://doi.org/10.1007/BF01078449
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DOI: https://doi.org/10.1007/BF01078449