Navickas, Zenonas, Tadas Telksnys, and Minvydas Ragulskis. “Special Multiplicative Operators for the Solution of ODE – Invariants and Representations”. International Journal of Engineering and Technology Innovation 5, no. 1 (January 1, 2015): 01-18. Accessed December 6, 2022. https://ojs.imeti.org/index.php/IJETI/article/view/60.