The Formation of γ-Valerolactone from Renewable Levulinic Acid over Ni-Cu Fly Ash Zeolite Catalysts by Margarita Popova, Silviya Boycheva, Ivan Dimitrov, Momtchil Dimitrov, Daniela Kovacheva, Daniela Karashanova, Nikolay Velinov, Genoveva Atanasova, Agnes Szegedi

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