@article{BUMI_1967_3_22_1_a2,
     author = {Grabiel, Federico},
     title = {Ordered operations in linearly ordered systems.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {15--24},
     publisher = {mathdoc},
     volume = {Ser. 3, 22},
     number = {1},
     year = {1967},
     zbl = {0146.01502},
     mrnumber = {211936},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1967_3_22_1_a2/}
}