Enforcing Dirichlet boundary conditions in physics-informed neural networks and variational physics-informed neural networks Stefano Berrone, Claudio Canuto, Moreno Pintore, Natarajan Sukumar (2023) Enforcing Dirichlet boundary conditions in physics-informed neural networks and variational physics-informed neural networks, In: HELIYON, pp. 1-20, ISSN: 2405-8440