Alfredson, H., Pietil?, T., Jonsson, P. and Lorentzon, R. (1998) Heavy-Loaded Eccentric Calf-Muscle Training for the Treatment of Chronic Achilles Tendinosis. American Journal of Sports Medicine, 26, 360-366.
 Mafi, N., Lorentzon, R. and Alfredson, H. (2001) Superior Results with Eccentric Calf-Muscle Training Compared to Concentric Training in a Randomized Prospective Multi-Center Study on Patients with Chronic Achilles Tendinosis. Knee Surgery, Sports Traumatology, Arthroscopy, 9, 42-47. http://dx.doi.org/10.1007/s001670000148
 Fahlstr?m, M., Jonsson, P., Lorentzon, R. and Alfredson, H. (2003) Chronic Achilles Tendon Pain Treated with Eccentric Calf-Muscle Training. Knee Surgery, Sports Traumatology, Arthroscopy, 11, 327-333.