References for the numbering systems

Col	Reference

---	---------

R1	Cuffey J. 1937, Ann. Harv. Coll. Obs. 105,433

R2	Babu G.S.D 1989, J. Astrophys. Astr. 10, 295

R3	Purgathofer A. 1964, Ann. Univ. Sternw. Wien 26 no 2

R4	Sujatha S. et al. 2006, Bull. Astr. Soc. India 34, 357

R5	Colegrove P.T. 1999, Thesis (PhD). University of Nevada, Reno 

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