by Kwak, Kyoung Duck, Ko, Chul Un, Ahn, Sang Min, Ahn, Kee Baek
Published in Journal of the Korean Fracture Society (2005)

by Kim, Young-Yong, Ahn, Jae-Yong, Sung, Yerl-Bo, Ko, Chul-Un, Shim, Jae-Chan, Park, Hae-Su, Bai, Gill-Han
Published in The Journal of arthroplasty (01.12.2001)

by Cho, Sung Do, Kim, Yeon Ho, Kim, Young Kyu, Kim, Sung Sook, Ko, Chul Un, Lee, Bub Jae
Published in The journal of the Korean Orthopaedic Association (1999)

by Kim, Y Y, Ko, C U, Ahn, J Y, Yoon, Y S, Kwak, B M
Published in Journal of bone and joint surgery. British volume (01.11.1988)