@article{10_21136_MB_1999_125980,
     author = {Pe\v{n}a, Sim\'on},
     title = {Discrete spectra criteria for singular difference operators},
     journal = {Mathematica Bohemica},
     pages = {35--44},
     publisher = {mathdoc},
     volume = {124},
     number = {1},
     year = {1999},
     doi = {10.21136/MB.1999.125980},
     mrnumber = {1687425},
     zbl = {0936.39008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1999.125980/}
}