de Niet, Mark, Susanne T. de Bot, Bart P.C. van de Warrenburg, Vivian Weerdesteyn, and Alexander C. Geurts. 2014. “Functional Effects of Botulinum Toxin Type-A Treatment and Subsequent Stretching of Spastic Calf Muscles: A Study in Patients With Hereditary Spastic Paraplegia”. Journal of Rehabilitation Medicine 47 (2):147-53. https://doi.org/10.2340/16501977-1909.