Adjenti, S. K., G. J. Louw, J. Jelsma, and M. Unger. “An Ultrasonographic Analysis of the Activation Patterns of Abdominal Muscles in Children With Spastic Type Cerebral Palsy and in Typically Developing Individuals: A Comparative Study”. Archives of Physiotherapy, vol. 8, no. 1, June 2018, doi:10.1186/s40945-018-0048-x.