V monografii izlozheny puchki obyknovennykh differentsial'nykh operatorov, zadannykh na konechnykh i beskonechnykh intervalakh, kak v sluchayakh prostykh korney, tak i v sluchayakh kratnykh korney glavnogo kharakteristicheskogo mnogochlena, s koeffitsientami, udovletvoryayushchimi opredelennym usloviyam algebraicheskikh sootnosheniy, usloviyam integriruemosti, a takzhe s matrichnymi periodicheskimi i pochti periodicheskimi koeffitsientami i ikh malymi vozmushcheniyami. Opisany spektral'nyy analiz etikh operatorov, razrabotany primery resheniya prakticheskikh zadach. Dlya spetsialistov v oblasti spektral'noy teorii differentsial'nykh uravneniy, matematicheskoy fiziki, a takzhe dlya prepodavateley i studentov fiziko-matematicheskikh fakul'tetov.