1. Periodic solutions of nonlinear wave equations

   • L. Cesari
   • R. Kannan

   OriginalPaper Pages: 295 - 312

2. Nonlinear scalar field equations, I existence of a ground state

   • H. Berestycki
   • P. -L. Lions

   OriginalPaper Pages: 313 - 345

3. Nonlinear scalar field equations, II existence of infinitely many solutions

   • H. Berestycki
   • P. -L. Lions

   OriginalPaper Pages: 347 - 375

4. Four inequalities for monotone gradient vector fields

   • A. T. Plant

   OriginalPaper Pages: 377 - 389