@article{SF_1986__35_134873,
     author = {S. Crvenkovic and M. Kunze},
     title = {Maximal subsemilattices of the full transformation semigroup.},
     journal = {Semigroup forum},
     pages = {245--250},
     publisher = {mathdoc},
     volume = {35},
     year = {1986},
     zbl = {0613.20042},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__35_134873/}
}