A. de O. Souza and A. Perez Filho, “Ksn Index and SL Index Application in the Study of the Knickpoints in Ribeira de Iguape River Longitudinal Profile, São Paulo State, Brazil”, Rev. Dep. Geogr., no. spe, pp. 208–217, Jun. 2017, doi: 10.11606/rdg.v0ispe.132180.