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Probably the reason you couldn't find it is that the last name is spelled 'Costeley'.
The original poem is by Pierre de Ronsard.
https://vault2.secured-url.com/handlo/pdf/a-f/CAFM--As.pdf
How I found it:
Google search #1 - search for Guillaume Costelet. Google corrected the spelling.
Google search #2 - search for Guillaume Costeley Cassandre.
What else can I help you with?
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Cassandre Creswell has written: 'Syntactic form and discourse function in natural language generation' -- subject(s): Comparative and general Grammar, Syntax, Computational linguistics, Data processing, Discourse analysis
