id	domain	url
educationr-1402	edrev.asu.edu	http://edrev.asu.edu/essays/v12n12index.html
educationr-1402	www.ipn.uni-kiel.de	http://www.ipn.uni-kiel.de/aktuell/stcse/stcse.html
educationr-1402	www.univie.ac.at	http://www.univie.ac.at/constructivism/evg/papers/117.pdf