On Neumann
problems for semilinear elliptic equations with critical nonlinearity:
existence and symmetry of multi-peaked solutions (1997)
,
(with Stani Maier and Klaus Schmitt)
Communications in Partial Differential Equations
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22, 1493 - 1527.
Even Hamiltonian systems on tori
and cotangent spaces of tori (1997)
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(with Thomas Bartsch)
Nonlinear Analysis, Theory, Methods and Applications
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30, 4123 - 4134.
Existence, nonexistence and symmetry
property of local and global minimizers for a semilinear elliptic problem
(1998)
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Discrete and Continuous Dynamical Systems
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Existence of many positive solutions of an elliptic equation
with
critical exponent
on an annulus (1999)
,
(with Michel Willem)
Proccedings of American Mathematical Society
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127, 1711 - 1714.
Positive solutions for elliptic equations with critical
growth in unbounded domains
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(with M. Ramos and M. Willem)
Calculus of variations and differential equations (Haifa, 1998)
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192 - 199, Chapman \& Hall/CRC Res. Notes Math., 410,
Chapman \& Hall/CRC, Boca Raton, FL, 2000.
Mountain Pass Theorem in Order Intervals and Multiple
Solutions for Semilinear Elliptic Dirichlet Problems (2000)
,
(with S. Li)
Journal d'Analyse Math\'ematiques
,
81, 373-396.
Morse theory without (PS) condition
at isolated values and strong resonant problems (2000)
,
(with N. Hirano and S. Li)
Calculus of Variations and Partial Differential Equations
,
10, 223 - 247.