Coates,R.M.; Shaw,J.E.
Journal of Organic Chemistry, 1970 , vol. 35, # 8 p. 2601 - 2605

Berzin,V.B. et al.
Journal of Organic Chemistry USSR (English Translation), 1973 , vol. 9, p. 1466 - 1472
Zhurnal Organicheskoi Khimii, 1973 , vol. 9, # 7 p. 1436 - 1443

Krawczyk, Ewa; Owsianik, Krzysztof; Skowronska, Aleksandra; Wieczorek, Michal; Majzner, Wieslaw
New Journal of Chemistry, 2002 , vol. 26, # 12 p. 1753 - 1767