@article{10_4153_S0008439520000909,
     author = {Szechtman, Fernando},
     title = {On the degree of repeated radical extensions},
     journal = {Canadian mathematical bulletin},
     pages = {877--885},
     year = {2021},
     volume = {64},
     number = {4},
     doi = {10.4153/S0008439520000909},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000909/}
}