Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Bernhard Pichler and Christian Hellmich,Upscaling quasi-brittle strength of cement paste and mortar: A multi-scale engineering mechanics model,Cement and Concrete Research,0008-8846,Elsevier BV,2011-05,41,5,467-476,https://cir.nii.ac.jp/crid/1363107370517233280,https://doi.org/10.1016/j.cemconres.2011.01.010