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to open science
Turk, C., Svete, J., Stanovnik, B., Golic, L., Golobic, A., & Selic, L. (2010). ChemInform Abstract: Unusual Reactions of 5,5-Dimethyl-2-(indenyl-2)-3-pyrazolidinone with Acetylenedicarboxylates. ChemInform, 31(21), no–no. doi:10.1002/chin.200021149 
10.1002/chin.200021149