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The book by A.N.Karapetyants and V.V.Kravchenko was published by Springer Nature at the end of 2022 and includes classical theory and also modern achievements. The book was written as part of the implementation of the Development Program of the Russian Federal University for the period 2018-2022. A.N.Karapetyants reads separate chapters from this book at the SFU as part of the course "Equations of Mathematical Physics".