@incollection{Gulyaeva15,
author = {Iwona Stanislawska and Tamara Gulyaeva},
title = {Ionospheric W Index Based on GNSS TEC in the Operational Use for Navigation Systems},
booktitle = {Satellite Positioning},
publisher = {IntechOpen},
address = {Rijeka},
year = {2015},
editor = {Shuanggen Jin},
chapter = {7},
doi = {10.5772/59902},
url = {https://doi.org/10.5772/59902}
}