Some links to documentation:

http://www.eng.tau.ac.il/~yash/kw-usenix06/index.html How to Build a Low-Cost, Extended-Range RFID Skimmer
http://www.rf-dump.org/

http://ww1.microchip.com/downloads/en/AppNotes/00710c.pdf AN710 Antenna Circuit Design for RFID Applications
http://www.ti.com/rfid/docs/manuals/refmanuals/rf-mgr-mnmn_ds.pdf S4100 Multi-Function Reader Module Data Sheet

http://www.ti.com/rfid/docs/manuals/appNotes/HF1000x600AntennaRev2.pdf
http://www.ti.com/rfid/docs/manuals/appNotes/HFAntennaCookbook.pdf
http://www.ti.com/rfid/docs/manuals/appNotes/HFAntennaDesignNotes.pdf


http://people.csail.mit.edu/rivest/pubs/JRS03.pdf The Blocker Tag: Selective Blocking of RFID Tags for Consumer Privacy
http://www.ti.com/lit/ug/scbu002a/scbu002a.pdf Tag-itTM HF-I Standard Transponder Chip/Inlays Commands and Options Reference Guide
http://www.ti.com/lit/ug/scbu008a/scbu008a.pdf Tag-itTM HF-I Pro Transponder Chip/Inlays Commands and Options Reference Guide
http://www.ti.com/lit/ug/scbu003a/scbu003a.pdf Tag-it TM HF-I Plus Transponder Chip/Inlays Extended Commands and Options Reference Guide
http://www.ti.com/lit/ug/scbu014/scbu014.pdf TI-RFidTM Product Manual Terms & Abbreviations Reference Guide
http://www.ti.com/rfid/docs/manuals/brochures/rfid_prodspec.pdf RFID Systems Product Specifications

http://www.ti.com/lit/ug/scbu004b/scbu004b.pdf Tag-itTM HF-I Plus Transponder Inlays Reference Guide
http://www.ti.com/lit/ug/scbu006b/scbu006b.pdf Tag-itTM HF-I Standard Transponder Inlays Reference Guide
http://www.ti.com/lit/ug/scbu009b/scbu009b.pdf Tag-itTM HF-I Pro Transponder Inlays Reference Guide
http://www.ti.com/lit/ds/scbs856/scbs856.pdf HF Reader System Series 6000 S6700 Multi-Protocol Transceiver IC
http://www.ti.com/lit/ug/scbu030/scbu030.pdf HF Reader System Series 6000 S6700 Multi Protocol Transceiver IC RI-R6C-001A Ref.Guide
http://www.ti.com/lit/ds/slou186f/slou186f.pdf TRF7960 TRF7961   MULTI-STANDARD FULLY INTEGRATED 13.56-MHZ RFID ANALOG FRONT END AND DATA-FRAMING READER SYSTEM