The fundamental mode of graded-index fibres: simple and accurate variational methods
1979 ◽
Vol 29
(3)
◽
pp. 287-292
◽
1977 ◽
Vol 9
(2)
◽
pp. 167-175
◽
1984 ◽
Vol 16
(3)
◽
pp. 197-205
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