Helmut Dorn. 1,3-Dipolar cycloaddition of pyrazolid-3-one azomethinimines and E-β-nitrostyrene - elucidation of the generation of seemingly “non cisoid” adducts // Tetrahedron Letters. 1985. Vol. 26. Issue 42. P. 5123-5126.
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http://dx.doi.org/10.1016/S0040-4039(00)98878-6