@article{10_4153_CMB_1971_074_0,
     author = {Williams, Kenneth S.},
     title = {Note on the {Number} of {Solutions} of f(x1) = f(x2) = ... =f(xr) over a {Finite} {Field}},
     journal = {Canadian mathematical bulletin},
     pages = {429--432},
     year = {1971},
     volume = {14},
     number = {3},
     doi = {10.4153/CMB-1971-074-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-074-0/}
}