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Chang, K.C. (1993) Infinite Dimensional Morse Theory and Multiple Solution Problem. Birkhäuser, Boston.
https://doi.org/10.1007/978-1-4612-0385-8

has been cited by the following article:

• TITLE: Sign Changing Solution of a Semilinear Schrödinger Equation with Constraint

  AUTHORS: Jingkun Liu, Qi Fan

  KEYWORDS: Semilinear Schrödinger Equation, Sign Changing Solution, Palais-Smale Condition, Pseudo-Gradient Vector Field

  JOURNAL NAME: Applied Mathematics, Vol.12 No.6, June 28, 2021

  ABSTRACT: The purpose of this paper is to study a semilinear Schrödinger equation with constraint in H1(RN), and prove the existence of sign changing solution. Under suitable conditions, we obtain a negative solution, a positive solution and a sign changing solution by using variational methods.