@article{ZNSL_2004_309_a4,
     author = {L. Yu. Kolotilina},
     title = {The singularity/nonsingularity problem for matrices satisfying diagonal dominance conditions in terms of directed graphs},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--83},
     year = {2004},
     volume = {309},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_309_a4/}
}