@article{ELA_2010__21__a4,
     author = {Bebiano, Natalia and Da Providencia, Joao and Da Providencia, Joao P.},
     title = {Classes of {non-Hermitian} operators with real eigenvalues},
     journal = {The electronic journal of linear algebra},
     pages = {98--109},
     publisher = {mathdoc},
     volume = {21},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2010__21__a4/}
}