Combined node and span protection strategies with node-encircling p-cycles. - John Doucette 001; Peter A. Giese; Wayne D. Grover (DRCN, 2005)

Physical-Layer p-Cycles Adapted for Router-Level Node Protection: A Multi-Layer Design and Operation Strategy. - John Doucette 001; Wayne D. Grover; Peter A. Giese (IEEE J. Sel. Areas Commun., 2007)