@article{:/content/aapt/journal/tpt/51/9/10.1119/1.4830072,
   author = "van Wijk, Kasper and Channel, Ted and Viskupic, Karen and Smith, Martin L.",
   title = "Teaching Geophysics with a Vertical-Component Seismometer",
   journal = "The Physics Teacher",
   year = "2013",
   volume = "51",
   number = "9", 
   eid = ,
   pages = "552-554",
   url = "http://scitation.aip.org/content/aapt/journal/tpt/51/9/10.1119/1.4830072",
   doi = "http://dx.doi.org/10.1119/1.4830072" 
}