APA (7th ed.) Citation
Hofer, H. H. (1981). A variational approach to a class of resonance problems with application to a wave equation problem.
Chicago Style (17th ed.) Citation
Hofer, Helmut H.W. A Variational Approach to a Class of Resonance Problems with Application to a Wave Equation Problem. Zürich, 1981.
MLA (9th ed.) Citation
Hofer, Helmut H.W. A Variational Approach to a Class of Resonance Problems with Application to a Wave Equation Problem. 1981.
Warning: These citations may not always be 100% accurate.