On the surface of Lorentz manifold whose normal bundles have special properties B. Papantoniou — 1982 Matematički Vesnik
Surfaces of Revolution in the 3-Dimensional Lorentz-Minkowski space E(^3_1) satisfying Δ^111_r=A_r B. Papantoniou; G. Kaimakamis; K. Petoumenos — 2005 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας