@article{36359,
  author       = {{Weber, J and Ernstberger, A and Reinsberger, Claus and Popp, D and Nerlich, M and Alt, V and Krutsch, W}},
  issn         = {{2052-1847}},
  journal      = {{BMC Sports Sci Med Rehabil}},
  number       = {{1}},
  pages        = {{132}},
  title        = {{{Video analysis of 100 matches in male semi-professional football reveals a heading rate of 5.7 headings per field player and match.}}},
  volume       = {{14}},
  year         = {{2022}},
}

@article{20471,
  author       = {{Baumgart, C and Welling, W and Hoppe, MW and Freiwald, J and Gokeler, A}},
  issn         = {{2052-1847}},
  journal      = {{BMC Sports Sci Med Rehabil}},
  pages        = {{23}},
  title        = {{{Angle-specific analysis of isokinetic quadriceps and hamstring torques and ratios in patients after ACL-reconstruction.}}},
  doi          = {{10.1186/s13102-018-0112-6}},
  volume       = {{10}},
  year         = {{2018}},
}