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2. Vovk, A.I., Kovalev, A.F. & Shamsutdinov, I.Z. (2014) Complex additive for concrete. RU 2528330 (in Russian)., Vovk, A.I., Kovalev, A.F. & Shamsutdinov, I.Z. (2014) Complex additive for concrete. RU 2528330 (in Russian).
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5. Vincent, D., Dananche, E., Quern, R. & Chun, B. (2009) Method for retarding the setting of the surface of a concrete using ester-based concrete surface retarders. WO 2010020857 A3., Vincent, D., Dananche, E., Quern, R. & Chun, B. (2009) Method for retarding the setting of the surface of a concrete using ester-based concrete surface retarders. WO 2010020857 A3.