1. G. Birkhoff. Lattice Theory, volume XXV. A.M.S. Colloquium Publications, Providence, Rhode Island, 1967.
2. C.W. Burrill. Measure, Integration and Probability. McGraw-Hill, New York, 1972.
3. B.A. Davey and H. A. Priestley. Introduction to Lattices and Order. Cambridge University Press, Cambridge, 1990.
4. G. De Cooman. Possibility theory: Conditional possibility. In preparation.
5. G. De Cooman. Possibility theory: Possibilistic independence. In preparation.