@article{JMAG_2008_4_1_a3,
     author = {F. Gesztesy and A. Pushnitski and B. Simon},
     title = {On the {Koplienko} spectral shift function. {I.~Basics}},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {63--107},
     year = {2008},
     volume = {4},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2008_4_1_a3/}
}