@book{Engestroem:1987,
  added-at = {2009-11-02T23:44:34.000+0100},
  address = {Helsinki},
  author = {Engeström, Yrjö},
  biburl = {http://www.bibsonomy.org/bibtex/20a4fa77c8c14efeb2e7c858120ec717d/jeahex},
  interhash = {d6d05ee14bec1e3c8fc1c3be40a1a165},
  intrahash = {0a4fa77c8c14efeb2e7c858120ec717d},
  keywords = {activity-theory},
  publisher = {Orienta-Konsulit},
  timestamp = {2009-11-02T23:44:34.000+0100},
  title = {Learning by expanding: An activity-theoretical approach to developmental research},
  year = 1987
}