Alexander Borodin
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String Quartet No.1 in A-dur (1874-79), AB 30
Vassil Valchev (violin) , String Quartet `Sofia` of the Bulgarian National Radio 
String Quartet `Sofia` of the Bulgarian National Radio (Vassil Valchev, Nikolay Gagov, Ognyan Stanchev, Nikolay Bespalov), OK Studio 2014
(1)
Bela Bartok
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String Quartet ¹ 2, op. 17 (1915 - 1917), BB 75
Vassil Valchev (violin) , String Quartet `Sofia` of the Bulgarian National Radio 
String Quartet `Sofia` of the Bulgarian National Radio (Vassil Valchev, Nikola Kovatchev, Krassimir Dechev, Plamen Velev), OK Studio 2014
(2)
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