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THE CORRESPONDENCE OF RUSSIAN MUSICIANS WITH JĀZEPS VĪTOLS AFTER HIS DEPARTURE FROM ST. PETERSBURG (REGARDING RARE VĪTOLIANA SOURCES AT THE LATVIAN ACADEMY OF MUSIC): PAR RETIEM VĪTOLIĀNAS AVOTIEM LATVIJAS MŪZIKAS AKADĒMIJĀ. MAR 2024, 12, 92-115.