TY  - JOUR
AU  - Goodarzi, Khodayar
TI  - Integrating factor, first integral and λ-symmetry for vector ODEs of second orders
JO  - Theory of Approximation and Applications
VL  - 18
IS  - 2
SP  - 1
EP  - 6
PY  - 2024
DO  - 
ER  -