@article{10_4153_S0008439521000047,
     author = {Azad, Morteza Baniasad and Khosravi, Behrooz},
     title = {On two conjectures about the sum of element orders},
     journal = {Canadian mathematical bulletin},
     pages = {30--38},
     year = {2022},
     volume = {65},
     number = {1},
     doi = {10.4153/S0008439521000047},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439521000047/}
}