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NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, vol. 50, no. 8, page. 1135 - 1151, 2002-10

COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS, vol. 29, no. 11-12, page. 1877 - 1904, 2004-01

CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS, vol. 18, no. 2, page. 207 - 219, 2003-10

ANNALES DE L INSTITUT HENRI POINCARE-ANALYSE NON LINEAIRE, vol. 27, no. 4, page. 1121 - 1152, 2010-07