Get the Whitepaper called Busqueda Binaria Aplicada a las Blind SQL Injection. Written in Spanish.
You can download it from the following link: https://packetstormsecurity.com/files/download/79455/binary-blindsql.pdf
Source: https://packetstormsecurity.com/files/79455/Busqueda-Binaria-Aplicada-a-las-Blind-SQL-Injection.html