1. From Numbers to Ring: The Early History of Ring Theory;Kleiner,1998
2. Emmy Noether Coursehttps://upcommons.upc.edu/bitstream/handle/2117/81399/CFME-vol-6.pdf?sequence=1&isAllowed=y
3. Introduction to non-commutative differential geometry;Connes,1984
4. Non-commutative differential geometry;Connes,1985
5. The action functional in non-commutative geometry;Connes,1988