Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
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Central composite design approach towards optimization of flamboyant pods derived steam activated carbon for its use as heterogeneous catalyst in transesterification of Hevea brasiliensis oil
Optimization of reactive extraction of castor seed to produce biodiesel using response surface methodology
The 12 references without a DOI — listed, not checked
no DOI — not checked10.1016/j.jece.2018.04.019_bib0050
no DOI — not checked10.1016/j.jece.2018.04.019_bib0095
no DOI — not checkedTwo steps ethanolysis of castor oil using sulphuric acid as catalyst to produce motor oil
no DOI — not checkedMethods for testing Commercial fatty acids, https://www.aocs.org/Documents/TechnicalPDF/Methods/6th/S1_64.pdf.
no DOI — not checkedEN 14104:2003, Fat and oil derivates. Fatty Acid Methyl Esters (FAME). Determination of acid value.
no DOI — not checked10.1016/j.jece.2018.04.019_bib0150
no DOI — not checkedWaste frying oil with high levels of free fatty acids as one of the prominent sources of biodiesel production
no DOI — not checkedEsterification of free fatty acids in waste oil using a carbon-based solid acid catalyst
no DOI — not checkedOptimization of esterification and transesterification of high FFA Jatropha curcas oil using response surface methodology
no DOI — not checkedOptimisation of biodiesel production from waste vegetable oil and eggshell ash
no DOI — not checked10.1016/j.jece.2018.04.019_bib0245
no DOI — not checkedAvailable at: http://www.fao.org/faostat/en/#data/QC/visualize.
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