// SPDX-License-Identifier: BSD-3-Clause
// Copyright (C) 2026 Vallés Puig, Ramon
//! Source references for the EGM2008 geopotential model.
//!
//! ## References
//!
//! * Pavlis, N. K., Holmes, S. A., Kenyon, S. C., & Factor, J. K. (2012).
//! The development and evaluation of the Earth Gravitational Model 2008
//! (EGM2008). JGR: Solid Earth, 117, B04406.
//! <https://doi.org/10.1029/2011JB008916>
//! * NGA EGM2008 product page:
//! <https://earth-info.nga.mil/index.php?dir=wgs84&action=wgs84>