http://www-s.ti.com/sc/ds/ina168.pdfhttp://www.zetex.com/3.0/a4-5.asphttp://www.zetex.com/3.0/appnotes/apps/an35.pdfhttp://www.linear.com/pdf/1787f.pdfhttp://www.linear.com/pdf/dn227f.pdf
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