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* [http://w140.com/tek_sd-20_user_manual.pdf Tektronix SD-20 User Manual (PDF)] | |||
* [http://w140.com/72nd_ARFTG_Conference_CD.pdf Harper, Ridler, and Salter Paper Discussing TDR with SD-20 (PDF)] | * [http://w140.com/72nd_ARFTG_Conference_CD.pdf Harper, Ridler, and Salter Paper Discussing TDR with SD-20 (PDF)] | ||