Considerations for cell passaging in cell culture seed trains
T. Hernández Rodriguez, R. Pörtner, B. Frahm, Considerations for Cell Passaging in Cell Culture Seed Trains, BioMed Central, 2015.

Model-based strategy for cell culture seed train layout verified at lab scale
S. Kern, O. Platas Barradas, M. Schaletzky, V. Sandig, B. Frahm, R. Pörtner, Model-Based Strategy for Cell Culture Seed Train Layout Verified at Lab Scale, BioMed Central, 2015.

Model-based design of the first steps of a seed train for cell culture processes
S. Kern, O. Platas, M. Schaletzky, V. Sandig, B. Frahm, R. Pörtner, Model-Based Design of the First Steps of a Seed Train for Cell Culture Processes, BioMed Central, 2013.