@article{PORMA_1977__36_3-4_115320,
     author = {Hiller, Howard},
     title = {Injectives in arrow categories},
     journal = {Portugaliae mathematica},
     pages = {239--246},
     publisher = {mathdoc},
     volume = {36},
     number = {3-4},
     year = {1977},
     mrnumber = {0597845},
     zbl = {0452.18006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_3-4_115320/}
}