F. Pacard, A-PRIORI REGULARITY FOR WEAK SOLUTIONS OF SOME NONLINEAR ELLIPTIC-EQUATIONS, Annales de l Institut Henri Poincare. Analyse non lineaire, 11(6), 1994, pp. 693-703
Let f(u) be some positive regular function bounded from above by u n/n
-2, in R+. We derive some necessary and sufficient conditions, in orde
r for all positive solutions to -DELTAu = f(u) is-an-element-of L(loc)
1 (R(n)) to be regular.