The Geometry of Walker Manifolds - Miguel Brozos-Vázquez; Eduardo García-Río; Peter Gilkey; Stana Nikcevic; Ramón Vázquez-Lorenzo (Morgan & Claypool Publishers, 2009)

Applications of Affine and Weyl Geometry - Eduardo García-Río; Peter Gilkey; Stana Nikcevic; Ramón Vázquez-Lorenzo (Morgan & Claypool Publishers, 2013)