@article{JAC_2013__37_1_a6,
     author = {Fancsali, Szabolcs L. and Sziklai, Peter and Tak\'ats, Marcella},
     title = {The number of directions determined by less than $q$ points},
     journal = {Journal of Algebraic Combinatorics},
     pages = {27--37},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2013__37_1_a6/}
}