@article{paperid:1087087,
author = {Etemadfard, Hossein and Masoud Mashhadi Hossainali},
title = {Modeling the ionospheric gradient by using VSS base functions and GPS data over Iran},
journal = {Advances in Space Research},
year = {2021},
volume = {67},
number = {6},
month = {March},
issn = {0273-1177},
pages = {1929--1936},
			numpages = {7},
keywords = {Slepian; Ionospheric Gradient; GPS observation},
}