. . . . . . "Two duets for violin and viola" . . . . "2 duets for violin and viola" . . "Two duets : for violin and viola" . "Duets for violin and viola" . . "Two Duets. For violin and viola. Edited by Paul Doktor. [Score.]" . "Two Duets. For violin and viola. Edited by Paul Doktor" . . . "Partitions" . . .