https://scholar.google.com/citations?hl=id&user=C1M5xDgAAAAJ https://garuda.ristekbrin.go.id/journal/view/19691 https://www.base-search.net/Search/Results?lookfor=tirtamath&name=&oaboost=1&newsearch=1&refid=dcbasen https://www.crossref.org/
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