Supersymmetry of the Schrödinger and pp-wave solutions in Einstein–Weyl supergravities Hai-Shan Liu and H. Lü Eur. Phys. J. C, 72 8 (2012) 2125 Published online: 21 August 2012 DOI: 10.1140/epjc/s10052-012-2125-8