@article{AFM_2009_34_1_a5,
     author = {Serguei A. Nazarov and Jan Sokolowski and Jari Taskinen},
     title = {Neumann {Laplacian} on a domain with tangential components in the boundary},
     journal = {Annales Fennici Mathematici},
     pages = {131--143},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_2009_34_1_a5/}
}