@article{Themens2012a,
author = "D. R. Themens and P. T. Jayachandran and R. B. Langley and J. W. Macdougall and M. J. Nicolls",
title = "Determining receiver biases in GPS-derived total electron content in the auroral oval and polar cap region using ionosonde measurements",
year = 2012 ,
journal = "GPS Solutions",
keywords = "amisr, risrn",
doi = "10.1007/s10291-012-0284-6"
}