Attached is the expertise of prof. T. Vlček, CSc., in whose upcoming monograph (the Arbor Vitae publishing house) the work will be published. It was presented at the Czech modern art exhibition Vergangene Zukunft: Tschechische Avantgarde 1902–1945 in the Künstelerhaus, Vienna (19. 11. 1993 – 9. 1. 1994) and under cat. No. 111 at the same exhibition in the Frederician, Kassel (30. 1. – 20. 3. 1994).