( n - 1 ) -dimensional generalized null scrolls in R 1 n . Balgetir, Handan; Ergüt, Mahmut — 2003 Acta Mathematica Academiae Paedagogicae Nyí regyháziensis. New Series [electronic only]
Null scrolls in the 3-dimensional Lorentzian space. Balgetir, Handan; Bektaş, Mehmet; Ergüt, Mahmut — 2003 APPS. Applied Sciences
On the B-scrolls in the 3-dimensional Lorentzian space Handan Balgetir; Mehmet Bektas; Mahmut Ergut — 2005 Kragujevac Journal of Mathematics