Authors: FRANCHI B LANCONELLI E SERRIN J

Citation: B. Franchi et al., EXISTENCE AND UNIQUENESS OF NONNEGATIVE SOLUTIONS OF QUASI-LINEAR EQUATIONS IN R(N), Advances in mathematics, 118(2), 1996, pp. 177-243

Authors: CITTI G GAROFALO N LANCONELLI E

Citation: G. Citti et al., HARNACK INEQUALITY FOR SUM OF SQUARES OF VECTOR-FIELDS PLUS A POTENTIAL, American journal of mathematics, 115(3), 1993, pp. 699-734