@article{SM_1985_50_1_a4,
     author = {A. Badzhadi and A. S. Demidov},
     title = {Existence, nonexistence and regularity theorems in a~problem with a~free boundary},
     journal = {Sbornik. Mathematics},
     pages = {67--84},
     year = {1985},
     volume = {50},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_50_1_a4/}
}