@article{10_14708_wm_v6i2_2420,
     author = {M. Burnat},
     title = {M. {Krzy\.za\'nski,} {R\'ownania} r\'o\.zniczkowe cz\k{a}stkowe rz\k{e}du drugiego, cz\k{e}\'s\'c {II}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 281--282},
     year = {1963},
     volume = {6},
     number = {2},
     doi = {10.14708/wm.v6i2.2420},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v6i2.2420/}
}