Withdrawal notice to: “Methane sensors based on ZnGa2O4 ceramics with addition of Er for combustion monitoring systems” [Opt. Mater. X 26C 100409] by Аleksei V. Almaev, Zhakyp T. Karipbayev, Ernar B. Zhurkin, Nikita N. Yakovlev, Olzhas I. Kukenov, Alexandr O. Korchemagin, Gulzhanat A. Akmetova-Abdik, Kuat K. Kumarbekov, Amangeldy M. Zhunusbekov, Leonid A. Mochalov, Ekaterina A. Slapovskaya, Anatoli I. Popov

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