1. Quenching points in distance labeled pictures;Arcelli,1984
2. Empiricism or idealism…;Meyer,1980
3. Measuring the sizes of concavities;Rosenfeld;Pattern Recognition Lett.,1985
4. Sequential operations in digital picture processing;Rosenfeld;J. ACM,1966
5. New fusion operations for digitized binary images and their applications;Suzuki,1982