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Dang, T. T., Dang, T. T., & Langer, P. (2007). One-pot synthesis of pyrazole-5-carboxylates by cyclization of hydrazone 1,4-dianions with diethyl oxalate. Tetrahedron Letters, 48(20), 3591–3593. doi:10.1016/j.tetlet.2007.03.093 
10.1016/j.tetlet.2007.03.093