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Asinger,F. et al.
Chemische Berichte, 1964 , vol. 97, p. 1555 - 1561

Asinger,F. et al.
Chemische Berichte, 1964 , vol. 97, p. 1555 - 1561

Pelter; Smith; Elgendy
Tetrahedron, 1993 , vol. 49, # 32 p. 7119 - 7132