@article{10_4153_CMB_2010_068_3,
     author = {Chapman, S. T. and Garc{\'\i}a-S\'anchez, P. A. and Llena, D. and Marshall, J.},
     title = {Elements in a {Numerical} {Semigroup} with {Factorizations} of the {Same} {Length}},
     journal = {Canadian mathematical bulletin},
     pages = {39--43},
     year = {2011},
     volume = {54},
     number = {1},
     doi = {10.4153/CMB-2010-068-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-068-3/}
}