@article {springerlink:10.2478/s12175-010-0041-7,
   author = {Maria Schimpf and Karl Svozil},
   affiliation = {Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstra\ss e 8-10/136, A-1040 Vienna, Austria},
   title = {A glance at singlet states and four-partite correlations},
   journal = {Mathematica Slovaca},
   publisher = {Versita, co-published with Springer-Verlag GmbH},
   issn = {0139-9918},
   pages = {701-722},
   volume = {60},
   issue = {5},
   url = {http://dx.doi.org/10.2478/s12175-010-0041-7},
   doi = {10.2478/s12175-010-0041-7},
   eprint = {arXiv:0901.0882},
   year = {2010}
}