@article{CRMATH_2006__343_4_239_0,
     author = {Fritz Gesztesy and Vadim Tkachenko},
     title = {When is a non-self-adjoint {Hill} operator a spectral operator of scalar type?},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {239--242},
     publisher = {Elsevier},
     volume = {343},
     number = {4},
     year = {2006},
     doi = {10.1016/j.crma.2006.06.014},
     language = {en},
}