Duplexes, White Allumwandlung, King Battery Mates, Move Cycles M. Dragoun The origin of the term "duplex" in helpmates, with many examples from compositions of various types.
Gems of Problem Art. Compositions of Master Hans Johner G. Baumgartner Problems by Hans Johner and 22 of his games with his own notes, including wins over Nimzowitsch.
Jaroslav Brada. Gallery of Czech Composers, Vol. 5 J. Brada, M. Dragoun A selection of Jaroslav Brada's compositions, edited by Michal Dragoun.