Monomi: Practical Analytical Query Processing over Encrypted Data Stephen Tu, M. Frans Kaashoek, Samuel Madden, Nickolai Zeldovich MIT CSAIL.
Robust Query Processing through Progressive Optimization SIGMOD 2004 Volker Markl, Vijayshankar Raman, David Simmen, Guy Lohman, Hamid Pirahesh, Miso Cilimdzic.
CPS216: Advanced Database Systems Notes 09:Query Optimization (Cost-based optimization) Shivnath Babu.