@article{10_4064_cm_65_2_201_211, author = {P. Erd\H{o}s and A. S\'ark\"ozy}, title = {Some solved and unsolved problems in combinatorial number theory, ii}, journal = {Colloquium Mathematicum}, pages = {201--211}, publisher = {mathdoc}, volume = {65}, number = {2}, year = {1993}, doi = {10.4064/cm-65-2-201-211}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-65-2-201-211/} }