@article{Lompscher1994,
  author    = {Lompscher, Joachim},
  title     = {Learning strategies : an essential component of learning activity},
  year      = {1994},
  language  = {en}
}
@article{Lompscher1994,
  author    = {Lompscher, Joachim},
  title     = {The sociohistorical school and the acquisition of mathematics},
  year      = {1994},
  language  = {en}
}