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A B S T R A C T S

1. Gronchi,G.F. and Milani,A.: `Proper Elements for Earth Crossing Asteroids and Comets' ACM99 Cornell University ITHACA (NY) 1999
2. Milani,A.,Chesley,S.R.,Valsecchi,G.B. and Gronchi,G.F.: `Automatic Monitoring of Future Earth Encounters Resonant and Non-Resonant' ACM99 Cornell University ITHACA (NY) 1999
3. Gronchi,G.F. and Milani,A.: `Secular Evolution of Meteoroid Streams' Bullettin of the American Astronomical Society 31st DPS Meeting Abstracts, Vol.31,N.4, 1999
4. Valsecchi,G.B.,Milani,A.,Gronchi,G.F. and Chesley,S.R.: 32st DPS Meeting Abstracts, 2000
5. Michel,P. and Gronchi,G.F.: 32st DPS Meeting Abstracts, 2000