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by rbonvall 2146 days ago
As far as I know, they were originally introduced by Niklaus Wirth to describe Pascal's syntax. See the last pages in this manual from 1973: https://www.research-collection.ethz.ch/bitstream/handle/20....
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jhrwalter 2145 days ago
They even go back to Algol 68: http://www.softwarepreservation.org/projects/ALGOL/book/Lind...
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