Akagi, R., Kanehisa, H., Kawakami, Y., & Fukunaga, T. (2008). Establishing a new index of muscle cross-sectional area and its relationship with isometric muscle strength. Journal of strength and conditioning research, 22(1), S. 82-87. doi:10.1519/JSC.0b013e31815ef675

Akagi, Ryota, Hiroaki Kanehisa, Yasuo Kawakami, and Tetsuo Fukunaga. "Establishing a New Index of Muscle Cross-sectional Area and Its Relationship With Isometric Muscle Strength." Journal of Strength and Conditioning Research 22, no. 1 (2008): S. 82-87.

Akagi, Ryota, Hiroaki Kanehisa, Yasuo Kawakami, and Tetsuo Fukunaga. "Establishing a New Index of Muscle Cross-sectional Area and Its Relationship With Isometric Muscle Strength." Journal of Strength and Conditioning Research 22.1 (2008): S. 82-87.