G-Wishart Normalising Constants for Gaussian Graphical Models // Computes G-Wishart normalising constants through a Fourier approach. Either exact analytical results, numerical integration or Monte Carlo estimation are employed. Details at C. Wong, G. Moffa and J. Kuipers (2024), doi:10.48550/arXiv.2404.06803. Also includes approximations of the ratio of normalising constants, see details at C. Wong, G. Moffa and J. Kuipers (2025), doi:10.48550/arXiv.2503.13046.