@article{Langner, author = {Langner, Normen}, title = {EnEV - Altes Haus, was tun?}, language = {de} } @article{Langner, author = {Langner, Normen}, title = {Sommerlicher W{\"a}rmeschutz}, language = {de} } @article{LierschLangnerOrgas, author = {Liersch, Klaus W. and Langner, Normen and Orgas, Steffen}, title = {Untersuchungen an einem First-Grat-L{\"u}ftungssystem}, language = {de} }