Muangkarn, P.; Janthasopha, J.; Suanoom, C. The Solutions of Diophantine Equation \frac{1^4}{v_1^4}+\frac{2^4}{v_2^4}+\frac{3^4}{v_3^4}+...+\frac{k^4}{v_k^4}=1. RMUTI Journal 2024, 17, 85-94.