Cooperative unsupervised training of the part-of-speech taggers in a bidirectional machine translation system Felipe Sánchez-Martínez author Juan Antonio Pérez-Ortiz author Mikel L Forcada author 2004-oct 4-6 text Proceedings of the 10th Conference on Theoretical and Methodological Issues in Machine Translation of Natural Languages Baltimore, Maryland conference publication sanchez-martinez-etal-2004-cooperative https://aclanthology.org/2004.tmi-1.15/ 2004-oct 4-6