@article{00772739, title = {Front-divisors of trees.}, journal = {Acta Mathematica Universitatis Comenianae. New Series}, volume = {61}, year = {1992}, pages = {69-84}, zbl = {0821.05041}, language = {en}, url = {http://dml.mathdoc.fr/item/00772739} }
Híc, P.; Nedela, R.; Pavlíková, S. Front-divisors of trees.. Acta Mathematica Universitatis Comenianae. New Series, Tome 61 (1992) pp. 69-84. http://gdmltest.u-ga.fr/item/00772739/