Díaz Díaz, Jesús Ildefonso (2005) On the Haim Brezis pioneering contributions on the location of free boundaries. In Elliptic and Parabolic Problems: A Special Tribute to the Work of Haim Brezis. Progress in nonlinear differential equations and their applications, 63 (63). Birkhäuser, Basel, pp. 217-234. ISBN 3-7643-7249-4