@article{DMPS_2010_30_2_a3,
     author = {Fernandes, C\'elia and Ramos, Paulo and Mexia, Jo\~ao},
     title = {Algebraic structureof step nesting designs},
     journal = {Discussiones Mathematicae. Probability and Statistics},
     pages = {221--235},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {2010},
     zbl = {1272.62051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMPS_2010_30_2_a3/}
}