by Gutman, Semion, Ha, Jun-Hong
Published in Journal of the Korean Mathematical Society (2010)

by Ha, Jun-Hong, Gutman, Semion
Published in Journal of the Korean Mathematical Society (2009)

by Ha, Jun-Hong, Nakagiri, Shin-Ichi
Published in Journal of the Korean Mathematical Society (2004)

by Ha, Jun-Hong, Nakagiri, Shin-Ichi
Published in Journal of the Korean Mathematical Society (01.09.2006)

by Vanualailai, Jito, Ha, Jun-Hong, Nakagiri, Shin-ichi
Published in Dynamics and stability of systems (1998)

by Ha, Jun-Hong, Nagiri, Shin-ichi
Published in Journal of the Korean Mathematical Society (01.07.2002)

by Park, Jong-Yeoul, Ha, Jun-Hong, Han, Hyo-Keun
Published in Journal of the Korean Mathematical Society (1997)

by Nakagiri, Shin-ichi, Ha, Jun-hong
Published in Taiwanese journal of mathematics (01.06.2001)

by Ha, Jun-Hong, Nakagiri, Shin-Ichi
Published in Nonlinear analysis (01.12.1997)

by Vanualailai, Jito, Nakagiri, Shin-ichi, Ha, Jun-Hong
Published in Mathematics and computers in simulation (01.01.1995)

by Ha, Jun-Hong, Gutman, Semion
Published in Journal of the Korean Mathematical Society (01.09.2009)

by Gutman, Semion, Ha, Jun-Hong
Published in Journal of the Korean Mathematical Society (01.09.2010)

by Ha, Jun-Hong, Nakagiri, Shin-Ichi
Published in Journal of the Korean Mathematical Society (30.09.2006)

by Ha, Jun-Hong, Nakagiri, Shin-Ichi
Published in Journal of the Korean Mathematical Society (01.05.2004)

by Ha, Jun-Hong, Nagiri, Shin-ichi
Published in Journal of the Korean Mathematical Society (01.07.2002)

by Hong Koo Ha Hyun Jun Park Nam Cheol Park
Published in 亚洲男性学杂志：英文版 (2011)