@article{10_1017_S2040618500034778,
     author = {Bostock, F. A. and Patterson, E. M.},
     title = {A generalisation of {Divinsky's} radical},
     journal = {Glasgow mathematical journal},
     pages = {75--87},
     year = {1963},
     volume = {6},
     number = {2},
     doi = {10.1017/S2040618500034778},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500034778/}
}