Lecture notes: Complete File
Some original articles :
AdS/CFT
J. M. Maldacena: The Large N Limit of Superconformal Field Theories and Supergravity
Preprint available at https://arxiv.org/abs/hep-th/9711200
E. Witten: Anti De Sitter Space And Holography
Preprint available at https://arxiv.org/abs/hep-th/9802150
E. Witten: Anti-de Sitter Space, Thermal Phase Transition, And Confinement In Gauge Theories
Preprint available at https://arxiv.org/abs/hep-th/9803131
I. Klebanov & E. Witten: AdS/CFT Correspondence and Symmetry Breaking
Preprint available at https://arxiv.org/abs/hep-th/9905104
Symmetries of AdS3
J. D. Brown & M. Henneaux : Central Charges in the Canonical Realization of Asymptotic Symmetries: An Example from Three-Dimensional Gravity
Published in Commun.Math.Phys. 104 (1986) 207-226
J. M. Maldacena & A. Strominger : AdS(3) black holes and a stringy exclusion principle
Preprint available at https://arxiv.org/abs/hep-th/9804085
CFT2
A.A. Belavin, A. M. Polyakov & A.B. Zamolodchikov : Infinite Conformal Symmetry in Two-Dimensional Quantum Field Theory
Published in Nucl.Phys. B241 (1984) 333-380
J. L. Cardy : Operator Content of Two-Dimensional Conformally Invariant Theories
Published in Nucl. Phys. B270 (1986) 186–204.
Some useful books/reviews/lecture notes :
* A broad overview of dualities in field and string theories can be found in
J. Polchinski: Dualities of Fields and Strings
Preprint available at https://arxiv.org/abs/1412.5704
* For gauge/gravity duality and related topics see
J. Kaplan : Lectures on AdS/CFT from the Bottom Up
Notes available at : http://sites.krieger.jhu.edu/jared-kaplan/files/2016/05/AdSCFTCourseNotesCurrentPublic.pdf
E. D'Hoker & D. Z. Freedman : Supersymmetric gauge theories and the AdS / CFT correspondence
e-Print available at https://arxiv.org/abs/hep-th/0201253
J. McGreevy: Holographic Duality With A View Toward Many-Body Physics
Preprint available at https://arxiv.org/abs/0909.0518
J. Zaanen et al.: The AdS/CMT Manual for Plumbers and Electricians
Article available here.
J. Maldacena: The Gauge/Gravity Duality
Book chapter available at https://arxiv.org/abs/1106.6073
M. Natsuume: AdS/CFT Duality User Guide
Book available at https://arxiv.org/abs/1409.3575
A. Zaffaroni: Introduction to the AdS/CFT correspondence
Article published at Class.Quant.Grav. 17 (2000) 3571-3597
* For CFT2 basics see (particularly chapter 4-6 and section 10.1 of)
P. Francesco, P. Mathieu & D. Sénéchal : Conformal Field Theory
This book is also known as the Yellow Book, the CFT Bible, the telephone directory etc.