Sociedad Mexicana de Fs̕ica. Divisin̤ de Gravitacin̤ y Fs̕ica Matemt̀ica. Taller (9th : 2011 : Colima, Mexico)
IX Workshop of the Gravitation and Mathematical Physics Division of the Mexican Physical Society : Colima, Mexico, 28 November-2 December 2011 / editors, Luis Arturo Ureą-Lp̤ez, Ricardo Becerril-Br̀cenas, Romǹ Linares-Romero.
Gravitation -- Congresses.
Mathematical physics -- Congresses.
Ureą Lopez, Luis Arturo.
Becerril-Br̀cenas, Ricardo.
Linares-Romero, Romǹ.