The Fermat principle in general relativity and applications
2002 ◽
Vol 43
(1)
◽
pp. 563-596
◽
1998 ◽
Vol 174
(1)
◽
pp. 161-207
◽
1996 ◽
Vol 28
(7)
◽
pp. 855-897
◽
2017 ◽
Keyword(s):
2012 ◽
Vol 182
(8)
◽
pp. 894
◽
Keyword(s):