@Book{Serra82,
  author =       "J. Serra",
  title =        "Image Analysis and Mathematical Morphology",
  publisher =    "Academic Press",
  year =         "1982",
} 
@Article{Haralick87,
  author =       "R. M. Haralick and S. R. Sternberg and X. Zhuang",
  title =        "Image analysis using mathematical morphology",
  journal =      "IEEE Trans. Pattern. Anal. Mach. Intel.",
  volume =       "9",
  number =       "4",
  pages =        "532-550",
  year =         "1987",
}