@article{MZ_1970__113_171278,
     author = {Horst Herrlich},
     title = {An {Example} in {Category} {Theory.}},
     journal = {Mathematische Zeitschrift},
     pages = {309--312},
     year = {1970},
     volume = {113},
     zbl = {0179.32102},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__113_171278/}
}