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September 2003An elementary proof of Small's formula for null curves in $\mathrm{PSL}(2,C)$ and an analogue for Legendrian curves in $\mathrm{PSL}(2,C)$
Masatoshi Kokubu, Masaaki Umehara, Kotaro Yamada "An elementary proof of Small's formula for null curves in $\mathrm{PSL}(2,C)$ and an analogue for Legendrian curves in $\mathrm{PSL}(2,C)$," Osaka Journal of Mathematics, Osaka J. Math. 40(3), 697-715, (September 2003)
