@article{riemannianoptimizationforvariance,
  title = {Riemannian Optimization for Variance Estimation in Linear Mixed Models},
  author = {Lena Sembach and Jan Pablo Burgard and Volker H. Schulz},
  year = {2022},
  eprint = {2212.09081},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2212.09081v1},
}