Brădeanu, Doina, and Cristina Brădeanu. “A Dual Variational Method for the Problem of Heat Conduction in Thick Non-Convex Plates”. Rev. Anal. Numér. Théor. Approx. 22, no. 2 (August 1, 1993): 137–148. Accessed April 14, 2025. https://ictp.acad.ro/jnaat/journal/article/view/1993-vol22-no2-art3.