Chemie Fur PTAMarion Romer, Silke Dittmar, Dorothee Famulla-Weber, Claudia Huppertz · First published 2021Open the Tome
Hedwig BollhagenMonika Dittmar, Gudrun Gorka-Reimus, Silke Kreibich, Heinz Schönemann, Heinz-Joachim Theis, Christiane Weidner, Hedwig Bollhagen · First published 2012Open the Tome
