A Dataset of High Impact Bugs: Manually-Classified Issue Reports. - Masao Ohira; Yutaro Kashiwa; Yosuke Yamatani; Hayato Yoshiyuki; Yoshiya Maeda; Nachai Limsettho; Keisuke Fujino; Hideaki Hata; Akinori Ihara; Ken-ichi Matsumoto (MSR, 2015)