Liens externes Pogson, N. R. -LRB- 1866 -RRB-, Minor Planet -LRB- 87 -RRB- Sylvia, Monthly Notices of the Royal Astronomical Society, Vol.
Pogson, N. R. -LRB- 1866 -RRB-, Minor Planet -LRB- 87 -RRB- Sylvia, Monthly Notices of the Royal Astronomical Society, Vol.