Miroslaw Kutylowski Krzysztof Lorys Brigitte Oesterdiekhoff Rolf Wanka Periodification scheme: constructing sorting networks with constant period. 944-967 2000 47 J. ACM 5 http://doi.acm.org/10.1145/355483.355490 db/journals/jacm/jacm47.html#KutylowskiLOW00