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In page Erg:
"The erg is not a part of the International System of Units (SI), which has been recommended since 1 January 1978[11] when the European Economic Community ratified a directive of 1971 that implemented SI as agreed by the General Conference of Weights and Measures.[12] It is the unit of energy in Gaussian units, which are widely used in astrophysics[13], applications involving microscopic problems and relativistic electrodynamics,[14] and sometimes in mechanics[citation needed].
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