References

 
• Aaquist, A., & Kwok, S. 1990, A&AS, 84, 229 NASA ADS  
• Acker, A., Marcout, J., Ochsenbein, F., Stenholm, & Tylenda, R. 1992, Strasbourg-ESO catalogue of galactic planetary nebulae, ESO  
• Dopita, M. A., Vassiliadis, E., Wood, P. R., et al. 1997, ApJ, 474, 188 NASA ADS  
• Fomalont, E., Synthesis imaging in radio astronomy, 1989, PASP 6, ed. A. Perley, F. R. Schwab, & A. Bridle, 222  
• Kohoutek, L. 1994, Astron. Nachr., 315, 235 NASA ADS  
• Pottasch, S. R. 1984, Planetary Nebulae (D. Reidel Dordrecht), 93, 97  
• Pottasch, S. R., & Acker, A. 1989, A&A, 221, 123 NASA ADS  
• Pottasch, S. R. 1992, A&ARv, 4, 256  
• Sault R. J., Teuben P. J., & Wright M. C. H. 1995, A retrospective of Miriad, Astronomical Data Analysis Softwared and Systems IV, ed. R. Shaw, H. E. Payne, & J. J. E. Hayes, ASP Conf. Ser., 77, 433  
• Van de Steene, G. C., & Zijlstra, A. A. 1995, A&A, 293, 541 NASA ADS  
• van Hoof, P. A. M., & Van de Steene, G. C. 1999, MNRAS, 308, 623 NASA ADS  
• van Hoof, P. A. M. 2000, MNRAS, 314, 99 NASA ADS  
• Walsh, J. R., Jacoby, G. H., Peletier, R. F., & Walton, N. A. 2000, SPIE, Discoveries and Research Prospects from 8 to 10-Meter Class Telescopes, 4005, 131  
• Zijlstra, A. A., Pottasch, S. R., & Bignell, C. 1989, A&AS, 79, 329 NASA ADS