Pasachoff, Jay M..
Astronomy Now / - 1st ed / - London : W.B. Saunders Company. - p.173 :
0-7216-7100-4
Mathematics
B9 / [M4]
Astronomy Now / - 1st ed / - London : W.B. Saunders Company. - p.173 :
0-7216-7100-4
Mathematics
B9 / [M4]