Drupal-Bibcite0<style face="normal" font="default" size="100%">Occurrence of Legionella in hot water systems of single-family residences in suburbs of two German cities with special reference to solar and district heating</style><style face="normal" font="default" size="100%">Occurrence of Legionella in hot water systems of single-family residences in suburbs of two German cities with special reference to solar and district heating</style>