@article{10_4064_sm177_3_1,
     author = {V. Khatskevich and L. Zelenko},
     title = {Plus-operators in {Krein} spaces and dichotomous behavior
 of irreversible dynamical systems with discrete time},
     journal = {Studia Mathematica},
     pages = {195--210},
     year = {2006},
     volume = {177},
     number = {3},
     doi = {10.4064/sm177-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm177-3-1/}
}