Samia Challal (2021) “Regularity of the Free Boundary in $div(a(x) \nabla u(x,y) )= -(h(x)\gamma(u))_x$ with $h^\prime (x)<0$”, International Journal of Mathematics And its Applications, 9(4), pp. 1–11. Available at: http://ijmaa.in/index.php/ijmaa/article/view/23 (Accessed: 26 April 2024).