TY  - RPRT
TI  - A singularity free analytical solution of artificial satellite motion with drag
AU  - Scheifele, G.
AU  - Mueller, A. C.
AU  - Starke, S. E.
PY  - 1977
UR  - https://ntrs.nasa.gov/citations/19780007204
ID  - 19780007204
ER  -