@article{JMLR:v21:18-473,
  author  = {Simon Bartels and Philipp Hennig},
  title   = {Conjugate Gradients for Kernel Machines},
  journal = {Journal of Machine Learning Research},
  year    = {2020},
  volume  = {21},
  number  = {55},
  pages   = {1--42},
  url     = {http://jmlr.org/papers/v21/18-473.html}
}