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Tautomerism and Acid-Base Properties of Formyl Derivatives of 1-Phenyl-3-methyl-4;5-dihydropyrazol-5-one and Its Thio Analog[J] A. I. Movchan;A. R. Kurbangalieva;O. N. Kataeva;I. A. Litvinov;G. A. Chmutova Russian Journal of General Chemistry 2003,
[2]
Synthesis of 5-oxo-2-pyrazoline-4-car-boxaldehydes Wallace D J;Straley J M; Journal of Organic Chemistry 1961,

