@article{10_4153_S0008439521000886,
     author = {Brits, Rudi and Schulz, Francois and Tour\'e, Cheick},
     title = {Commutativity via spectra of exponentials},
     journal = {Canadian mathematical bulletin},
     pages = {815--824},
     year = {2022},
     volume = {65},
     number = {4},
     doi = {10.4153/S0008439521000886},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439521000886/}
}