@article{10_4064_ba56_1_5,
     author = {Petru Cojuhari and Jan Janas},
     title = {Unbounded {Jacobi} {Matrices} with {Empty} {Absolutely
Continuous} {Spectrum}},
     journal = {Bulletin of the Polish Academy of Sciences. Mathematics},
     pages = {39--51},
     publisher = {mathdoc},
     volume = {56},
     number = {1},
     year = {2008},
     doi = {10.4064/ba56-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ba56-1-5/}
}