Marcos B. S. Tavares Kamil Sh. Zigangirov Gerhard Fettweis Tail-Biting LDPC Convolutional Codes Based on Protographs. 1047-1051 2007 conf/vtc/2007f VTC Fall http://dx.doi.org/10.1109/VETECF.2007.227 db/conf/vtc/vtc2007f.html#TavaresZF07