@article{broo_ballart_juan_valls_latinjak_2012, 
  title={Situational motivation and core affect in physical activity classes}, 
  volume={29}, 
  publisher={Asociación Española de Ciencias del Deporte}, 
  author={Broo and Ballart and Juan and Valls and Latinjak}, 
  year={2012}
  }