Is duplicate code more frequently modified than non-duplicate code in software evolution?: an empirical study on open source software. - Keisuke Hotta; Yukiko Sano; Yoshiki Higo; Shinji Kusumoto (EVOL/IWPSE, 2010)

An Empirical Study on the Impact of Duplicate Code. - Keisuke Hotta; Yui Sasaki; Yukiko Sano; Yoshiki Higo; Shinji Kusumoto (Adv. Softw. Eng., 2012)