@inproceedings{inproceedingsa9a2ddac,
title   = {Recognizable sets with multiplicities in the tropical semiring},
author = {Simon, Imre},
year = {1988},
doi = {10.1007/BFb0017135},
publisher = {Springer},
booktitle   = {International Symposium on Mathematical Foundations of Computer Science - MFCS}
}