1. Al-Thani, H.M.J.: -projective semimodules, KOBE Journal of Mathematics, 13, 49–59 (1996)
2. Baccelli, F.L., Cohen, G., Olsder, G.J., Quadrat, J.P.: Synchronization and Linearity: An Algebra for Discrete Event Systems. John Wiley & Sons, New York (1992)
3. Blyth, T.S.: Module Theory: An Approach to Linear Algebra. Clarendon Press, Oxford (1977)
4. Cassandras, C.G.: Discrete Event Systems: Modeling and Performance Analysis, Irwin, Boston (1993)
5. Cohen, G., Gaubert, S., Quadrat, J.P.: Max-plus algebra and system theory: where we are and where to go now, Annual Reviews in Control, 23, 207–219 (1999)