References

1 Harshaw, R., 2002, Webb Society Deep-Sky Observer, 128, 1-7.

2 Courtot, J.-F., 2000, Webb Society Double Star Section Circular, No. 9.

3 Gellera, D., 1980, Webb Society Quarterly Journal, 42, 4.

4 Gellera, D., 1982, Webb Society Double Star Section Circular, No. 2.

5 Gellera, D., 1984, Webb Society Double Star Section Circular, No. 3.

6 Gellera, D., 1989, Webb Society Double Star Section Circular, No. 4.

7 See http://ad.usno.navy.mil/star/star cats rec.html (note the underscore between star and cats and cats and rec)

8 West, D., 2001, Webb Society Double Star Section Circular, No.10.

9 Boltwood, P., Dec. 1991-Feb 1992, IAPPP Communications, No. 46, 48-56.

10 Boltwood, P., 1996, IAPPP Communications, No. 62, 45-6.

Chapter 20

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