@article{10_4064_sm_113_2_109_125,
     author = {Wies{\l}aw Cupa{\l}a},
     title = {The upper bound of the number of eigenvalues for a class of perturbed {Dirichlet} forms},
     journal = {Studia Mathematica},
     pages = {109--125},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {1995},
     doi = {10.4064/sm-113-2-109-125},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-113-2-109-125/}
}