Characterization of volatile metabolites taken up by or released from Streptococcus pneumoniae and Haemophilus influenzae by using GC-MS Wojciech Filipiak, Andreas Sponring, Maria Bauer, Clemens Ager, Anna Filipiak, Helmut Wiesenhofer, Nagl Markus, Jakob Troppmair and Anton Amann 2012 doi:10.1099/mic.0.062687-0