The single photon state, the quantum vacuum and the elementary electron/positron charge, Theodore E. Simos

Meis C., Dahoo P.R., Zacharoula Kalogiratou and Theodore Monovasilis (eds).AIP Conference Proceedings : International Conference of Computational Methods in Sciences and Engineering 2018 (ICCMSE-2018), Mar 2018, Thessaloniki, Greece. AIP, 2040, pp.020011, (2018)