1. Astrophysical Quantities;Allen,1973
2. Solar motion and velocity distribution of common stars;Delhaye,1965
3. Intrinsic distributions of cometary perihelia and magnitudes;Everhart;Astron.J.,1967
4. HCN radio emission from Comet Kohoutek (1973f);Huebner;Icarus,1974
5. The distribution of the directions of perihelia and of the orbital poles of non-periodic comets;Hurnik;Acta Astron.,1959