@article{GranacherSchellbachKleinetal.2014,
  author    = {Urs Granacher and J{\"o}rg Schellbach and Katja Klein and Olaf Prieske and Jean-Pierre Baeyens and Thomas M{\"u}hlbauer},
  title     = {Effects of core strength training using stable versus unstable surfaces on physical fitness in adolescents},
  journal   = {BMC sports science, medicine \& rehabilitation},
  series    = {a randomized controlled trial},
  volume    = {6},
  doi       = {10.1186/2052-1847-6-40},
  year      = {2014},
}