Kamassury, J. K. S., Meira Filho, D. P., Silva, C. da R., Pampolha Júnior, J. B. S. ., Silva, R. D. R. da, & Pinto, A. R. . (2021). Calculation of the creation and annihilation operators of a free particle in the light cone coordinate formalism. The Journal of Engineering and Exact Sciences, 7(4), 13317–01. https://doi.org/10.18540/jcecvl7iss4pp13317-01-15e