Clark, Micheal A.; Lucett, Scott C.; Corn, Rodney J., eds. (2008). "Ball Squat, Curl to Press". NASM Essentials of Personal Fitness Training. Lippincott Williams & Wilkins. p. 286. ISBN978-0-7817-8291-3.
Jeong, Siwoo; Lee, Dae-Yeon; Choi, Dong-Sung; Lee, Hae-Dong (2014). "Acute effect of heel-drop exercise with varying ranges of motion on the gastrocnemius aponeurosis-tendon's mechanical properties". Journal of Electromyography and Kinesiology. 24 (3): 375–79. doi:10.1016/j.jelekin.2014.03.004. PMID24717405.
Willems, T.M.; De Clercq, D.; Delbaere, K.; Vanderstraeten, G.; De Cock, A.; Witvrouw, E. (2006). "A prospective study of gait related risk factors for exercise-related lower leg pain". Gait & Posture. 23 (1): 91–98. doi:10.1016/j.gaitpost.2004.12.004. PMID16311200.
Knobloch, Karsten; Schreibmueller, Louisa; Longo, Umile Giuseppe; Vogt, Peter M. (2008). "Eccentric exercises for the management of tendinopathy of the main body of the Achilles tendon with or without the AirHeel Brace. A randomized controlled trial. A: Effects on pain and microcirculation". Disability & Rehabilitation. 30 (20–22): 1685–91. doi:10.1080/09638280701786658. PMID18720121. S2CID36134550.
Jeong, Siwoo; Lee, Dae-Yeon; Choi, Dong-Sung; Lee, Hae-Dong (2014). "Acute effect of heel-drop exercise with varying ranges of motion on the gastrocnemius aponeurosis-tendon's mechanical properties". Journal of Electromyography and Kinesiology. 24 (3): 375–79. doi:10.1016/j.jelekin.2014.03.004. PMID24717405.
Willems, T.M.; De Clercq, D.; Delbaere, K.; Vanderstraeten, G.; De Cock, A.; Witvrouw, E. (2006). "A prospective study of gait related risk factors for exercise-related lower leg pain". Gait & Posture. 23 (1): 91–98. doi:10.1016/j.gaitpost.2004.12.004. PMID16311200.
Knobloch, Karsten; Schreibmueller, Louisa; Longo, Umile Giuseppe; Vogt, Peter M. (2008). "Eccentric exercises for the management of tendinopathy of the main body of the Achilles tendon with or without the AirHeel Brace. A randomized controlled trial. A: Effects on pain and microcirculation". Disability & Rehabilitation. 30 (20–22): 1685–91. doi:10.1080/09638280701786658. PMID18720121. S2CID36134550.
Knobloch, Karsten; Schreibmueller, Louisa; Longo, Umile Giuseppe; Vogt, Peter M. (2008). "Eccentric exercises for the management of tendinopathy of the main body of the Achilles tendon with or without the AirHeel Brace. A randomized controlled trial. A: Effects on pain and microcirculation". Disability & Rehabilitation. 30 (20–22): 1685–91. doi:10.1080/09638280701786658. PMID18720121. S2CID36134550.