Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Leonard J. Barbour,Crystal porosity and the burden of proof,Chemical Communications,1359-7345,Royal Society of Chemistry (RSC),2006,,11,1163,https://cir.nii.ac.jp/crid/1364233271265564800,https://doi.org/10.1039/b515612m