@article{10_4153_CJM_1975_045_9,
     author = {Magid, Andy R.},
     title = {Ultrafunctor},
     journal = {Canadian journal of mathematics},
     pages = {372--375},
     year = {1975},
     volume = {27},
     number = {2},
     doi = {10.4153/CJM-1975-045-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-045-9/}
}