Dr. Alok Kumar. 2024. “CONVERGENCE THEOREM AND OBTAINED EXPANSION FOR THE VECTOR FUNCTION OF SECOND ORDER DIFFERENTIAL EQUATIONS”. Journal of Validation Technology, ISSN: 1079-6630, E-I SSN: 2150-7090 UGC CARE II 30 (3):35-47. https://doi.org/10.1080/jvtnetwork.v30i3.60.