@article{10_4153_S0008439524000390,
     author = {Cihan, Mehmet Sefa and Williams, Gerald},
     title = {Strong digraph groups},
     journal = {Canadian mathematical bulletin},
     pages = {991--1000},
     year = {2024},
     volume = {67},
     number = {4},
     doi = {10.4153/S0008439524000390},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439524000390/}
}