Ville Leppänen Martti Penttonen Martti Forsell A layout for sparse cube-connected-cycles network. 32-37 2011 CompSysTech http://doi.acm.org/10.1145/2023607.2023614 conf/compsystech/2011 db/conf/compsystech/compsystech2011.html#LeppanenPF11