By Carlo Rovelli
Appears in collection : Twistors and Loops Meeting in Marseille / Théorie des twisteurs et gravitation quantique à boucles
By Eleni-Alexandra Kontou
By Abhay Ashtekar
By Robert Wald
By Sebastiano Bernuzzi
By Stephen Coombes , Peter Liddle
By Aaron Brown
By Victor Kleptsyn
By Jean Feydy
By François-Xavier Vialard