Nazarov, Serguei A., Jan Sokolowski, and Jari Taskinen. “Neumann Laplacian on a Domain With Tangential Components in the Boundary”. Annales Fennici Mathematici 34, no. 1 (February 1, 2009): 131–143. Accessed November 25, 2024. https://afm.journal.fi/article/view/135256.