@book { UntersuchungdesPotenzialsvonBiomethanalsErdgassubstitut, title = "Untersuchung des Potenzials von Biomethan als Erdgassubstitut", author = "Jan-Claudio {Sachar}", year = "2012", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783842827745", url = "https://m.diplom.de/document/229114" }