1. J. Serra, Image Analysis and Mathematical Morphology (Academic, London, 1982).
2. P. Switzer, Ann. Math. Stat. 36, 1859–1863 (1965).
3. A. Yu. Ambos and G. A. Mikhailov, Russ. J. Numer. Anal. Math. Model. 26 (3), 213–232 (2011).
4. A. Yu. Ambos, Sib. Zh. Vychisl. Mat. 19 (1), 19–32 (2016).
5. G. A. Mikhailov, USSR Comput. Math. Math. Phys. 23 (3), 28–33 (1983).