id	domain	url
esrj-63007	dx.doi.org	http://dx.doi.org/10.15446/esrj.v21n1.63007
esrj-63007	dx.doi.org	http://dx.doi.org/10.15446/esrj.v20n1.63007
esrj-63007	dx.doi.org	http://dx.doi.org/10.7498/aps.63.060401