@incollection{MEM_2010_39_1_a6,
     author = {Dimovski, Ivan and Tsankov, Yulian},
     title = {Nonlocal {Boundary} {Value} {Problems} for {Two-Dimensional} {Potential} {Equation} on a {Rectangle}},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {105--113},
     year = {2010},
     volume = {39},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a6/}
}