Sandeep Bhadra Sanjay Shakkottai Piyush Gupta Min-Cost Selfish Multicast With Network Coding. 5077-5087 2006 52 IEEE Transactions on Information Theory 11 http://doi.ieeecomputersociety.org/10.1109/TIT.2006.883636 db/journals/tit/tit52.html#BhadraSG06