@article{10_37236_2524,
     author = {Daniel K. Du and Qing-Hu Hou},
     title = {Partially ordinal sums and {\(P\)-partitions}},
     journal = {The electronic journal of combinatorics},
     year = {2012},
     volume = {19},
     number = {4},
     doi = {10.37236/2524},
     zbl = {1267.05023},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2524/}
}