@article{10_14708_cm_v18i2_5822,
     author = {P. Kranz},
     title = {Sandwich and extension theorems on semigroups and lattices},
     journal = {Commentationes Mathematicae},
     pages = { 193--200},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1975},
     doi = {10.14708/cm.v18i2.5822},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v18i2.5822/}
}