[12] Cuninghame-Green, R.A., The characteristic maxpolynomial of a matrix.
J. Math. Analysis and Applications 95 (1983), 110-116.
[13] Cuninghame-Green, R.A., Minimax Algebra and Applications in: Advances
in Imaging and Electron Physics. Vol. 90, pp. 1-121 (Academic Press, New
York, 1995).
[14] M. Develin, F. Santos and B. Sturmfels: On the rank of a tropical matrix,
arXiv:math.CO/0312114.
[15] Gassner, E., Variants of the Assignment and of the Transportation Prob-
lem, PhD thesis, Graz, 2004.
[16] Gondran M., and M. Minoux, Linear Algebra of Diolds: a survey of recent
results. Annals of Discrete Mathematics 19 (1984), 147-164.
[17] Lewis, S. C., On the Best Pricipal Submatrix Problem, PhD thesis, Uni-
versity of Birmingham, in preparation.
[18] Rosen, K. H. (ed), Handbook of discrete and combinatorial mathematics,
Boca Raton; London : CRC Press, 2000.
[19] van Leeuwen, J. (ed), Graph Algorithms, in Handbook of theoretical com-
puter science - Vol.A : Algorithms and complexity, 525-631, Amsterdam;
Oxford : Elsevier; Cambridge, MA : MIT Press, 1990.
[20] Zimmermann, U., Linear and Combinatorial Optimization in Ordered Al-
gebraic Structures. Annals of Discrete Mathematics 10 (North Holland,
Amsterdam, 1981).
20