Analysis of the anomalous quartic WWWW couplings at the LHeC and the FCC-he E. Gurkanli, V. Ari, A. A. Billur and M. Köksal Eur. Phys. J. Plus, 136 7 (2021) 784 Published online: 29 July 2021 DOI: 10.1140/epjp/s13360-021-01775-4