References for the numbering systems

Col	Reference

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

R1	Murdin P., Penston M.V. 1977, Mon. Not. R. Astron. Soc. 181, 657

R2	Duerr R., Imhoff C.L., Lada C.L. 1982, Astrophys. J. 261, 135

R3	Manova G.A. 1959, Soviet Astr. AJ 3, 188

R4	Haro G., Iriarte B., Chavira E. 1953, Bol. Obs. Tonantzintla y Tacubaya 8, 3

R5	Dolan C., Mathieu R.D. 1999, Astron. J. 118, 2409

R6	Dolan C., Mathieu R.D. 2001, Astron. J. 121, 2124

R7	Barrado y Navascues D., et al. 2004, Astrophys. J. 610, 1064

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