deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index 42301fb..67b1302 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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howpublished = {Internet},  url = {http://www.tektron.ie/ultrasonic_sensors.htm},  }  @misc{RockwellAutomation,  author = {Rockwell Automation},  title = {{Ultrasonic Sensing}},  howpublished = {Internet},  url = {http://www.ab.com/en/epub/catalogs/12772/6543185/12041221/12041229/print.html},  }