@article{AA_2004_16_1_a3,
     author = {D. Alpay and I. Gohberg},
     title = {Pairs of selfadjoint operators and their invariants},
     journal = {Algebra i analiz},
     pages = {70--120},
     publisher = {mathdoc},
     volume = {16},
     number = {1},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AA_2004_16_1_a3/}
}