@article{CMUC_2000_41_3_a18,
     author = {Smol{\'\i}kov\'a, Petra},
     title = {Homomorphism duality for rooted oriented paths},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {631--643},
     year = {2000},
     volume = {41},
     number = {3},
     mrnumber = {1795092},
     zbl = {1033.05051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2000_41_3_a18/}
}