@misc{Hopf1983,
  author    = {Hopf, Diether},
  title     = {Foreign worker's children in primary and secondary schools},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-35969},
  year      = {1983},
  language  = {en}
}
@misc{Hopf1983,
  author    = {Hopf, Diether},
  title     = {The children of aliens in West German schools: situation and problems},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-36374},
  year      = {1983},
  abstract  = {Contents: - GENERAL OUTLINE OF PROBLEMS AND QUANTITATIVE SITUATION - THE CHILDREN OF FOREIGN NATIONALS IN THE EDUCATION SYSTEM - DIFFERENTIATION ACCORDING TO NATIONALITY - DIFFERENTIATION BETWEEN "GENERATIONS" - SCHOOL AND TEACHING PROBLEMS - THE HETEROGENEITY OF SCHOOLCHILDREN - INSTRUCTION},
  language  = {en}
}
@misc{Hopf1983,
  author    = {Hopf, Diether},
  title     = {Setting out : preschool and primary school},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-35939},
  year      = {1983},
  abstract  = {- Entering school - Capacity of preschool facilities and developments in the primary school - Instruction in the primary school - Report cards, being kept back, and advancement to secondary school},
  language  = {de}
}