References

1 Muirden, J., 1980, Amateur Astronomers Handbook, 297-304.

2 Pither, C.M., June 1980, Sky & Telescope, 519-23.

4 Argyle, R.W., 1986, Webb Society Deep-Sky Observer's Handbook, (vol. 1: Double Stars), 41.

5 Schwarzschild, K., 1896, Astron. Nachr., 139 (3335), 353-60.

6 Richardson, L., J. Brit. Astron Assoc., 35 (1924), 105-6, 155-7; 37 (1927), 247-50, 311-17; 38 (1928), 258-61.

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