@article{01332370,
title = {Optimal natural dualities for some quasivarities of distributive double },
journal = {Acta Mathematica Universitatis Comenianae. New Series},
volume = {67},
year = {1998},
pages = {249-271},
zbl = {0922.06012},
language = {en},
url = {http://dml.mathdoc.fr/item/01332370}
}
Saramago, M.J. Optimal natural dualities for some quasivarities of distributive double . Acta Mathematica Universitatis Comenianae. New Series, Tome 67 (1998) pp. 249-271. http://gdmltest.u-ga.fr/item/01332370/