@article{TRSPY_1994_203_a22,
     author = {S. Dierolf and S. M\"uller},
     title = {Some remarks on weak acyclicity},
     journal = {Informatics and Automation},
     pages = {249--254},
     publisher = {mathdoc},
     volume = {203},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1994_203_a22/}
}