Monografiya posvyashchena izucheniyu kachestvennykh i spektral"nykh svoystv resheniy uravneniy i sistem uravneniy smeshannogo tipa, v chastnosti uravneniya Chaplygina, modeliruyushchego plosko-parallel"nye okolozvukovye techeniya, v tselyakh dal"neyshey razrabotki metoda printsipa maksimuma, al"terniruyushchego metoda tipa Shvartsa, metoda vspomogatel"nykh funktsiy i metoda spektral"nykh razlozheniy dlya izucheniya kraevykh zadach Trikomi, Franklya, obobshchennoy zadachi Trikomi i drugikh dlya vazhnykh klassov uravneniy smeshannogo tipa i resheniya problem, ostavshikhsya otkrytymi s 50 - 60-kh godov XX stoletiya. Dlya nauchnykh rabotnikov v oblasti differentsial"nykh uravneniy, prepodavateley, aspirantov i studentov starshikh kursov vuzov.