1. On sets of integers which contain no 3 terms in arithmetic progression;Behrend,1946
2. On non-averaging sets of integers;Moser;Canad. J. Math.,1953
3. On sets of numbers containing no l terms in arithmetic progression;Riddell;Nieuw Arch. Wisk.,1969
4. Sur quelques ensembles d'entiers;Roth;C. R. Acad. Sci. Paris,1952