Several DOI landing pages appear as duplicates.
Here is an example
Considering one case, it appears that the pages https://doi.esrf.fr/10.15151/ESRF-ES-112688911 and https://doi.esrf.fr/10.15151/esrf-es-112688911 have both been crawled by Google for unknown reason but only the second was indexed. I want all the pages in our sitemap file to be indexed. All entries in the sitemap are in the uppercase format. The idea to solve this issue is to indicate in the page itself which is the canonical page to be used. It the example above, the canonical page is https://doi.esrf.fr/10.15151/ESRF-ES-112688911.