1. Lattice theory;Birkhoff,1967
2. A compendium of continuous lattices;Gierz,1980
3. Iteration of morphological transformations;Heijmans;CWI Quarterly,1989
4. Morphological filtering and iteration;Heijmans,1990
5. Theoretical aspects of gray-level morphology;Heijmans;IEEE Transactions on Pattern Analysis and Machine Intelligence,1991