@article{10_4153_CJM_1974_115_6,
     author = {Blanchard, Andrew A.},
     title = {Structure {Species} and {Constructive} {Functors}},
     journal = {Canadian journal of mathematics},
     pages = {1217--1227},
     year = {1974},
     volume = {26},
     number = {5},
     doi = {10.4153/CJM-1974-115-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-115-6/}
}