References for the numbering systems

Col	Reference

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

R1	Cuffey J. 1938, Ann. Harv. Coll. Obs. 106,39

R2	Kaluzny J., Mazur B. 1991, Acta Astr. 41, 191

R3	Maciejewski G. & Niedzielski A. 2007, Astron. Astrophys. 467, 1065

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