@conference {cCasas94,
	title = {Residual image coding using mathematical morphology},
	booktitle = {IEEE International Conference on Acoustics, Speech and Signal Processing},
	year = {1994},
	pages = {597{\textendash}600},
	isbn = {0-7803-1775-0},
	author = {Casas, J. and Torres, L.}
}
