Geunseok Yang Seungsuk Baek Jung-Won Lee Byungjeong Lee Analyzing emotion words to predict severity of software bugs: a case study of open source projects. 1280-1287 2017 SAC https://doi.org/10.1145/3019612.3019788 conf/sac/2017 db/conf/sac/sac2017.html#YangBLL17