@article{10_4153_CMB_1973_043_5,
     author = {Meisen, Jeanne},
     title = {Pullbacks in {Regular} {Categories}},
     journal = {Canadian mathematical bulletin},
     pages = {251--255},
     year = {1973},
     volume = {16},
     number = {2},
     doi = {10.4153/CMB-1973-043-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-043-5/}
}