1.
Graef JR, Heidarkhani S, Kong L. Infinitely many solutions for systems of multi-point boundary value problems using variational methods. TMNA [Internet]. 2013 Apr. 22 [cited 2024 Dec. 13];42(1):105-18. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2013.027