id	domain	url
spir-8832	spir.aoir.org	http://spir.aoir.org
spir-8832	igraph.org	http://igraph.org
spir-8832	cran.r-project.org	http://cran.r-project.org/package=twitter
spir-8832	doi.org	http://doi.org/10.1080/17512786.2015.1087811