@article{10_4153_CJM_1976_044_7,
     author = {Usher, A. O.},
     title = {Plethysm of {S-Functions}},
     journal = {Canadian journal of mathematics},
     pages = {440--445},
     year = {1976},
     volume = {28},
     number = {2},
     doi = {10.4153/CJM-1976-044-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-044-7/}
}