@article{neumaier_groeneveld_1998, 
  title={Restricted maximum likelihood  estimation of covariances  in sparse linear models}, 
  volume={30}, 
  DOI={10.1051/gse:19980101}, 
  publisher={Springer Nature America, Inc}, 
  author={Neumaier and Groeneveld}, 
  year={1998}
  }