47 citations · 47 across the 1 of their papers we have counts for
1 paper
Jianyang Li, J. Patrick Harrington, Kazimierz J. Borkowski
The WFPC2 camera aboard the HST was used to obtain images of the planetary nebula BD+30 3639 at two epochs separated by 5.663 years. The expansion of the nebula in the H-alpha and…