@article{AIF_2002__52_6_1833_0,
     author = {Erd\H{o}s, L\'aszl\'o},
     title = {Spectral shift and multiplicity of the first eigenvalue of the magnetic {Schr\"odinger} operator in two dimensions},
     journal = {Annales de l'Institut Fourier},
     pages = {1833--1874},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {52},
     number = {6},
     year = {2002},
     doi = {10.5802/aif.1936},
     mrnumber = {1954326},
     zbl = {1106.35039},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1936/}
}