@book{ 0-1148216731, title = {A guide to duo and trio playing}, author = {Oortmerssen, Jacques van}, address = {Sneek, Holland}, publisher = {Boeyenga}, year = {1998}, edition = {5. impr.}, language = {Undetermined}, note = {c 1986}, url = {https://katalog.hmt-leipzig.de/Record/0-1148216731} }