author       = "Johanson, J. and Bilger, R. and Brodowski, W. and Calen, H.
                      and Clement, H. and Ekstrom, Curt and Fransson, K. and
                      Greiff, J. and Gustafsson, L. and Haggstrom, S. and Hoistad,
                      B. and Johansson, A. and Johansson, T. and Khoukaz, A. and
                      Koch, I. and Kullander, S. and Kupsc, A. and Marciniewski,
                      P. and Morosov, B. and Oelert, W. and Povtoreiko, A. and
                      Ruber, R. and Scobel, W. and Sefzick, T. and Shwartz, B. and
                      Stepaniak, J. and Sukhanov, A. and Wagner, G.J. and
                      Zabierowski, J. and Zlomanczuk, J.",
      title        = "Two-pion production in proton proton collisions near
      year         = "2002",