M45 - M49 viola solo
M224 - M228 viola with piano accompaniment
M286 - M287 duets - two string instruments
M290-M291 duets - wind and string instruments
M1014 viola concertos with orchestra
M1015 viola concertos (usually arranged for piano reduction)
M1114 viola concertos with string orchestra
M115 viola concertos (usually arranged for piano reduction)
ML900 - ML905 history and criticism
Dictionaries / Encyclopedias