Chakraborty, Monti, Sanjay Kumar, Barin Kumar De, and Anirban Guha. 2014. “Latitudinal Characteristics of GPS Derived Ionospheric TEC: A Comparative Study With IRI 2012 Model”. Annals of Geophysics 57 (5):A0539. https://doi.org/10.4401/ag-6438.