Lee, Jae Chul, Cha, Jang-Kyu, Kim, Yongdai, Kim, Yon-Il and Shin, Byung-Joon (2008). Quantitative Analysis of Back Muscle Degeneration in the Patients with the Degenerative Lumbar Flat Back using a Digital Image Analysis: Comparison with the normal controls. Spine, 33(3). 318-325.