@ARTICLE{
author={Ewers Rolf,Seemann Rudolf,Krennmair Gerald,Schicho Kurt,Kurdi Ayman Omar,Kirsch Axel,Reichwein Astrid},
year={2010},
title={Planning Implants Crown Down-A Systematic Quality Control for Proof of Concept},
journal={JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY},
volume={68},
number={11},
pages={2868-2878},
document_type={Article},
} 

@ARTICLE{
author={Weinlaender Michael,Lekovic Vojislav B,Spadijer-Gostovic Sanja,Milicic Biljana R,Krennmair Gerald,Plenk Hanns Jr},
year={2009},
title={Gingivomorphometry - esthetic evaluation of the crown-mucogingival complex: a new method for collection and measurement of standardized and reproducible data in oral photography},
journal={CLINICAL ORAL IMPLANTS RESEARCH},
volume={20},
number={5},
pages={526-530},
document_type={Article},
}