@conference {witkowski_ec12, title = {Peer Prediction without a Common Prior}, booktitle = {Proceedings of the 13th ACM Conference on Electronic Commerce (EC {\textquoteright}12)}, year = {2012}, pages = {964-981}, url = {http://econcs.seas.harvard.edu/files/econcs/files/witkowski_ec12.pdf}, author = {Jens Witkowski and David C. Parkes} }