@article{PORMA_1967__26_2_115022,
     author = {Janowitz, M.F.},
     title = {Residuated closure operators},
     journal = {Portugaliae mathematica},
     pages = {221--252},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1967},
     mrnumber = {0249331},
     zbl = {0204.02702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115022/}
}