TY  - BOOK
AU  - Ryabov,Y.
AU  - Yankovsky,G.
TI  - An elementary survey of celestial mechanics
T2  - Dover Books on Science
PY  - 1961///)
CY  - New York
PB  - Dover
UR  - http://www.archive.org/details/elementarysurvey00ryab
UR  - http://www.openlibrary.org/books/OL24206018M
ER  -