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Лесин, Виктор Васильевич. Уравнения математической физики [электронный ресурс]: Учебник / В. В. Лесин. — 1. — Москва: ООО "КУРС", 2020 — 240 с. — ВО - Бакалавриат. — <URL:https://znanium.com/catalog/document?id=346882>. — <URL:https://znanium.com/cover/0961/961832.jpg>.
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