@book{id_12974,
author = "Gerlach, C. and Fecher, T.",
title = "Approximations of the GOCE Error Variance-Covariance Matrix for Least-Squares Estimation of Height Datum Offsets",
year = "2012",
series = "Journal of Geodetic Science",
volume = "2, 4",
url = "https://doi.org/10.2478/v10156-011-0049-0",
}