@misc{WachsmuthWachsmuth2024, author = {Daniel Wachsmuth and Gerd Wachsmuth}, title = {A simple proof of the Baillon-Haddad theorem on open subsets of Hilbert spaces}, booktitle = {Journal of Convex Analysis}, volume = {30}, number = {4}, url = {https://www.heldermann.de/JCA/JCA30/JCA304/jca30059.htm}, institution = {FG Optimale Steuerung}, type = {articler}, pages = {1319 -- 1328}, year = {2024}, }