APA
Koller H., Zenner J., Hitzl W., Resch H., Stephan D., Augat P., Penzkofer R., Korn G., Kendell A., Meier O. & Mayer M. (20131223). The impact of a distal expansion mechanism added to a standard pedicle screw on pullout resistance. A biomechanical study. : The spine journal : official journal of the North American Spine Society.
Chicago
Koller Heiko, Zenner Juliane, Hitzl Wolfgang, Resch Herbert, Stephan Daniel, Augat Peter, Penzkofer Rainer, Korn Gundobert, Kendell Arvind, Meier Oliver and Mayer Michael. 20131223. The impact of a distal expansion mechanism added to a standard pedicle screw on pullout resistance. A biomechanical study. : The spine journal : official journal of the North American Spine Society.
Harvard
Koller H., Zenner J., Hitzl W., Resch H., Stephan D., Augat P., Penzkofer R., Korn G., Kendell A., Meier O. and Mayer M. (20131223). The impact of a distal expansion mechanism added to a standard pedicle screw on pullout resistance. A biomechanical study. : The spine journal : official journal of the North American Spine Society.
MLA
Koller Heiko, Zenner Juliane, Hitzl Wolfgang, Resch Herbert, Stephan Daniel, Augat Peter, Penzkofer Rainer, Korn Gundobert, Kendell Arvind, Meier Oliver and Mayer Michael. The impact of a distal expansion mechanism added to a standard pedicle screw on pullout resistance. A biomechanical study. : The spine journal : official journal of the North American Spine Society. 20131223.