@unpublished{KostyukGorensteinStoeckeretal.2005,
  author  = {Andriy P. Kostyuk and Mark I. Gorenstein and Horst St{\"o}cker and Walter Greiner},
  title   = {Second cluster integral and excluded volume effects for the pion gas},
  institution = {Physik},
  year    = {2005},
}