@article{10_4064_aa_11_4_419_432,
     author = {Andrzej Schinzel},
     title = {On sums of roots of unity {(Solution} of two problems of {R.} {M.} {Robinson)}},
     journal = {Acta Arithmetica},
     pages = {419--432},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1965},
     doi = {10.4064/aa-11-4-419-432},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-11-4-419-432/}
}