Somnath Dey & Debasis Samanta 
Unimodal and Multimodal Biometric Data Indexing [PDF ebook] 

This work is on biometric data indexing for large-scale identification systems with a focus on different biometrics data indexing methods. It provides state-of-the-art coverage including different biometric traits, together with the pros and cons for each. Discussion of different multimodal fusion strategies are also included.