The Collected Papers of AlbertEinstein: https://einsteinpapers.press.princeton.edu/

CURSOS:

https://www.mathpages.com/rr/rrtoc.htm

https://itec.if.usp.br/~rivelles/Seminars/introd_relat_geral_aula1.pdf

https://professor.ufabc.edu.br/~pieter.westera/RelGeral.pdf

https://www.cbpf.br/~ftovar/images/Einstein_Espacotempo.pdf

PY4112: Gravitation and Cosmology: https://www.physics.ucc.ie/apeer/py4112.html

https://www.visualrelativity.com/

https://www.staff.science.uu.nl/~hooft101/lectures/gr.html

https://www.astro.ucla.edu/~wright/relatvty

https://www.das.inpe.br/~alex/Ensino/cursos/relatividade/aula_TRG_CEU.pdf