@article{10_4153_CMB_1971_095_0,
     author = {Riddell, J.},
     title = {A {Lattice} {Point} {Problem} {Related} to {Sets} {Containing} {No} {l-Term} {Arithmetic} {Progression}},
     journal = {Canadian mathematical bulletin},
     pages = {535--538},
     year = {1971},
     volume = {14},
     number = {4},
     doi = {10.4153/CMB-1971-095-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-095-0/}
}