{"id":"davidovits2019ancient","DOI":"10.1016/j.matlet.2018.10.033","URL":"https://doi.org/10.1016/j.matlet.2018.10.033","type":"article-journal","title":"Ancient geopolymer in south-American monument. SEM and petrographic evidence","author":[{"given":"Joseph","family":"Davidovits"},{"given":"Luis","family":"Huaman"},{"given":"Ralph","family":"Davidovits"}],"issued":{"date-parts":[[2019]]},"year-text":"2019","container-title":"Materials Letters","catalog-key":"SRC0D69YAPW0FZK"}