@article{NSJOM_1972_2_Nonea_0,
     author = {Stojakovi\'c Mirko},
     title = {On a theorem of {G.} {P.} {Barker} on triangular 

 matrices},
     journal = {Novi Sad Journal of Mathematics},
     pages = {1-5},
     publisher = {mathdoc},
     volume = {2},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1972_2_Nonea_0/}
}