Free Boundary Regularity for Surfaces Minimizing Area(S) + c Area(∂S)
Edith A. Cook · Transactions of the American Mathematical Society · 1985
Edith A. Cook, Free Boundary Regularity for Surfaces Minimizing $\operatorname{Area}(S) + c \operatorname{Area}(\partial S)$, Transactions of the American Mathematical Society, Vol. 290, No. 2 (Aug., 1985), pp. 503-526