@article{ZNSL_1972_30_a5,
     author = {V. G. Maz'ya},
     title = {On {Beurling's} theorem on the minimum principle for positive harmonic functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {76--90},
     publisher = {mathdoc},
     volume = {30},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_30_a5/}
}