1.
Ardyanto S, Tuwankotta JM. Normal Form of Periodic FPU Chain of Four Particles with Alternating Masses. J. Math. Fund. Sci. [Internet]. 2025Nov.7 [cited 2026Jan.4];57(1):54-69. Available from: https://journals.itb.ac.id/index.php/jmfs/article/view/25803