Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) WILLIAMS JA,Lactic acid jet test : in vitro erosion rates of glass ionomer dental cements containing radiopacifying elements,Biomater,,,1993,14,,551-555,https://cir.nii.ac.jp/crid/1570572701178103936,https://doi.org/10.1016/0142-9612(93)90245-w