On the integral invariants of a closed ruled surface
2001 ◽
Vol 6
(2)
◽
pp. 137-145
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2015 ◽
Vol 08
(01)
◽
pp. 1550009
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Keyword(s):
1997 ◽
Vol 32
(2)
◽
pp. 261-277
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2019 ◽
Vol 16
(06)
◽
pp. 1950093
Keyword(s):
2014 ◽
Vol 7
(2)
◽
pp. 31-40
Keyword(s):