@article{SF_1981__23_134520,
     author = {T. Nordahl},
     title = {Lattice representation in exchange transfusion.},
     journal = {Semigroup forum},
     pages = {275--275},
     year = {1981},
     volume = {23},
     zbl = {0471.92007},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134520/}
}