@article{JCA_2018_25_4_JCA_2018_25_4_a15,
     author = {J. Ferrera and J. G\'omez Gil},
     title = {Generalized {Takagi-Van} der {Waerden} {Functions} and their {Subdifferentials}},
     journal = {Journal of convex analysis},
     pages = {1355--1369},
     year = {2018},
     volume = {25},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/JCA_2018_25_4_JCA_2018_25_4_a15/}
}