Concert voor violen [2], altviool en cello, 1936, "Concerto for string quartet"

Concerto for violins [2], viola and cello, 1936, "Concerto for string quartet"

Konzert für Violinen [2], Bratsche und Cello, 1936, "Concerto for string quartet"

Concerto pour violons [2], alto et violoncelle, 1936, "Concerto for string quartet"