Analysis of the anomalous quartic WWWW couplings at the LHeC and the FCC-heE. Gurkanli, V. Ari, A. A. Billur and M. KöksalEur. Phys. J. Plus, 136 7 (2021) 784DOI: https://doi.org/10.1140/epjp/s13360-021-01775-4