@article{10_21136_CMJ_1996_127271,
     author = {Magill, K. D., Jr.},
     title = {The largest proper regular ideal of $S(X)$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {73--82},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1996},
     doi = {10.21136/CMJ.1996.127271},
     mrnumber = {1371689},
     zbl = {0903.20034},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1996.127271/}
}