1. Almond, M.: 1951,Mon. Not. R. astr. Soc.,111, 37?44.
2. Andreev, V.V., O.I. Belkovich, T.K. Filimonova., V.V. Sidorov.: 1992,Asteroids, Comets, Meteors 1991, eds. A. Harris and E. Bowell, pp.17?19, Lunar and Planetary Institute, Houston, Texas.
3. Andrianov, N.S., R.A. Kurganov, A.M. Nasirov and V.V. Sidorov: 1968,IAU Symposium 33: Physics and Dynamics of Meteors, eds. ?. Kres�k and P.M. Millman, pp.14?26, Reidel, Dordrecht, The Netherlands.
4. Andrianov, K.N.S., U.A. Pupysev and V.V. Sidorov: 1970,Mon. Not. R. astr. Soc.,148, 227?237.
5. Baggaley, W.J., Taylor, A.D. and Steel, D.I., 1992a, inPeriodic Comets, eds. J.A. Fern�ndez and H. Rickman, Universidad de la Rep�blica, Montevideo, Uruguay p.115.