Braided bimodules, quantum jet bundles and quantum geodesics
By Shahn Majid Majid
Theory of gravitational waves and approximation methods in general relativity
By Luc Blanchet
Appears in collection : Space Time Matrices
https://indico.math.cnrs.fr/event/4272/attachments/2260/2717/IHESConference_Harold_STEINACKER.pdf