References

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• Linfield R.P., 1986, AJ 92, 21
• Massi M., 1989, A&A 208, 392 NASA ADS
• Massi M., Comoretto G., 1990, A&A 228, 569 NASA ADS
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• Walker R.C., 1986, Synthesis imaging, Perley R.A., Schwab F.R. & Bridle A.H. (eds.). NRAO Workshop, p. 202