Expression of concern for 'Highly porous copper-supported magnetic nanocatalysts: made of volcanic pumice textured by cellulose and applied for the reduction of nitrobenzene derivatives' by Reza Taheri-Ledari , , 2021, , 25284-25295, https://doi.org/10.1039/D1RA03538J.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10961954PMC
http://dx.doi.org/10.1039/d4ra90026jDOI Listing

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