@article{PORMA_1959__18_4_114825,
     author = {Carlitz, L.},
     title = {Quadratic residues and {Tchebycheff} polynomials},
     journal = {Portugaliae mathematica},
     pages = {193--198},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1959},
     mrnumber = {0125059},
     zbl = {0098.03702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1959__18_4_114825/}
}