The Acquisition of Imperfective Aspect Marking in Korean as a Second Language by Japanese Learners. - Ju-Yeon Ryu; Kaoru Horie; Yasuhiro Shirai (PACLIC, 2010)

The L1 Acquisition of the Imperfective Aspect Markers in Korean: a Comparison with Japanese. - Ju-Yeon Ryu (Int. J. Asian Lang. Process., 2012)