@conference{Langner:2008ac,
   Author = {Langner, J. and M{\"o}lle, H. and Dittrich, S. and Will, E. and van den Hoff, J.},
   Booktitle = {IEEE Medical Imaging Conference Dresden},
   Month = {October},
   Organization = {IEEE},
   Title = {{Event-by-Event Attenuation Measurement for ACS2-Based PET Systems}},
   Year = {2008}
}