TY  - RPRT
TI  - Frameless navigation and endoscopy.
AU  - O Alberti
AU  - T Riegel
AU  - D Hellwig
AU  - H Bertalanffy
PY  - 2001
DO  - 10.3171/jns.2001.95.3.0541a
UR  - https://pubmed.ncbi.nlm.nih.gov/11565885/
ID  - 11565885
ER  -