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Izvestiya of Saratov University.
Mathematics. Mechanics. Informatics
ISSN 1816-9791 (Print)
ISSN 2541-9005 (Online)
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strongly irregular pencil
Expansion in Eigenfunctions of Quadratic Strongly Irregular Pencils of Differential Operators of the Second Order
Expansion in Root Functions of Strongly Irregular Pencil of Differential Operators of the Second Order with Multiple Characteristics
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