3 http://hdl.handle.net/10338.dmlcz/153131 3 A generalised Ricci-Hessian equation on Riemannian manifolds http://hdl.handle.net/10338.dmlcz/153132 A generalised Ricci-Hessian equation on Riemannian manifolds The CR geometry of the three-segment snake http://hdl.handle.net/10338.dmlcz/153130 The CR geometry of the three-segment snake