@article{TM_2002_239_a20,
     author = {J. Horv\'ath},
     title = {On the {Thickness} of $\langle p,q\rangle$ {Point} {Systems}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {318--322},
     publisher = {mathdoc},
     volume = {239},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2002_239_a20/}
}