@article{10_4064_sm_123_1_43_80,
     author = {Krzysztof Bogdan},
     title = {The boundary {Harnack} principle for the fractional {Laplacian}},
     journal = {Studia Mathematica},
     pages = {43--80},
     year = {1997},
     volume = {123},
     number = {1},
     doi = {10.4064/sm-123-1-43-80},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-123-1-43-80/}
}