Boyd, Jeffrey H. “A Paradigm Shift in Mathematical Physics, Part 3: A Mirror Image of Feynmans Quantum Electrodynamics (QED)”. JOURNAL OF ADVANCES IN MATHEMATICS 11, no. 2 (August 4, 2015): 3977–3991. Accessed May 2, 2024. https://rajpub.com/index.php/jam/article/view/11-2-1283.