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WikiPedia: Ralat piawai //pubmed.ncbi.nlm.nih.gov/16223828 //www.ncbi.nlm.nih.gov/pmc/articles/PMC1255808 //www.worldcat.org/issn/0959-8138 https://mathvault.ca/hub/higher-math/math-symbols/... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12558...