Transversal Surfaces of Timelike Ruled Surfaces in Minkowski 3-Space
  In this study we give definitions and characterizations of transversal surfaces of timelike ruled surfaces. We study some special cases such as the striction curve is a geodesic, an asymptotic line or a line of curvature. Moreover, we obtain developable conditions for transversal surfaces of a timelike ruled surface. 
Mehmet \"Onder
math.DG