1. Conformal symmetry for relativistic point particles;Casalbuoni;Phys. Rev. D,2014
2. The early universe;Kolb;Front. Phys.,1990
3. General Aspects of the de Sitter phase;Imponente,2004
4. Introduction to early universe cosmology;Brandenberger,2011
5. Bi-local field in gravitational shockwave background;Kanda;Prog. Theor. Exp. Phys.,2015