@article{10_4064_ap_24_1_77_86,
     author = {Zdzis{\l}aw Denkowski},
     title = {Linear problems for systems of difference equations},
     journal = {Annales Polonici Mathematici},
     pages = {77--86},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1970},
     doi = {10.4064/ap-24-1-77-86},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-24-1-77-86/}
}