@article{10_4153_CMB_1975_053_2,
     author = {V\'ertesi, P. O. H.},
     title = {On a {Problem} of {P.} {Tur\'an}},
     journal = {Canadian mathematical bulletin},
     pages = {283--288},
     year = {1975},
     volume = {18},
     number = {2},
     doi = {10.4153/CMB-1975-053-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-053-2/}
}