@article{JEMS_2012_14_2_a5,
     author = {Zur Izhakian and Eugenii Shustin},
     title = {Idempotent semigroups and tropical algebraic sets},
     journal = {Journal of the European Mathematical Society},
     pages = {489--520},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2012},
     doi = {10.4171/jems/309},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/309/}
}