| Year | Author | Article |
| 2009 | Feist, Wolfgang | Retrofits using Passive House components: also for step-by-step modernisations! |
| 2009 | Bastian, Zeno | Case study: step-by-step modernisation with economic optimisation of energy efficiency measures |
| 2009 | Kaufmann, Berthold | Insulation measures for the external envelope |
| 2009 | Kaufmann, Berthold; John, Markus | Window replacement in step-by-step retrofits |
| 2009 | Schulz, Tanja | Building services for step-by-step modernisations |
| 2009 | Kah, Oliver | Cost-effectiveness of energy saving measures for building modernisation |
| 2009 | Rongen, Ludwig; Wirtz, R.; Nabrotzky, T. | Energy-relevant optimisation of existing buildings with high design requirements - overview of examples |
| 2009 | Bastian, Zeno | Overview of inter-dependence of individual energy efficiency measures |