@article{10_21136_MB_1997_125911,
     author = {Do\v{s}l\'y, Ond\v{r}ej and Hilscher, Roman},
     title = {Spectral properties of fourth order differential operators},
     journal = {Mathematica Bohemica},
     pages = {153--168},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {1997},
     doi = {10.21136/MB.1997.125911},
     mrnumber = {1460945},
     zbl = {0894.34028},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/MB.1997.125911/}
}