Journal of Pure and Applied Mathematics: Advances and Applications[1] A. Altin, Harmonic curvatures of null curves and the null helix in
International Mathematical Forum 2(23)
(2007), 1111-1118.
[2] R. Aslaner and A. İ. Boran, On the geometry of null curves in the
Minkowski 4-space, Turk. J. Math. 33 (2009), 265-272.
[3] K. L. Duggal and A. Bejancu, Lightlike Submanifolds of
Semi-Riemannian Manifolds and Applications, Kluwer Academic
Publishers, Dordrecht / Boston / London, 1996.
[4] N. Ekmekçi, H. H. Hacisalihoglu and K. İlarslan, Harmonic
curvatures in Lorentzian space, Bull. Malays. Math. Sci. Soc. (Second
Series) 23 (2000), 173-179.
[5] E. İyigün and K. Arslan, On harmonic curvatures of curves in
Lorentzian n-space, Commun. Fac. Sci. Univ. Ank. Series A1 54(1)
(2005), 29-34.
[6] B. O’Neill, Semi-Riemannian Geometry with Applications to
Relativity, Academic Press, New York, 1983.
[7] F. A. Yaliniz and H. H. Hacisalihoglu, Null generalized helices in
and 
3 and 4-dimensional Lorentzian space,
Mathematical and Computational Applications 10(1) (2005), 105-111.
[8] F. A. Yaliniz and H. H. Hacisalihoglu, Null generalized helices in
Bull. Malays. Math. Sci. Soc. (II) 30(1)
(2007), 74-85.
[9] F. A. Yaliniz, H. Kabadayi and H. H. Hacisalihoglu,
AW(k) type curves for osculating 3rd order null Frenet
curves, Hadronic Journal 30(1) (2007), 81-92.
