@article{JMLR:v18:17-492,
  author  = {Zolt{{\'a}}n Szab{{\'o}} and Bharath K. Sriperumbudur},
  title   = {Characteristic and Universal Tensor Product Kernels},
  journal = {Journal of Machine Learning Research},
  year    = {2018},
  volume  = {18},
  number  = {233},
  pages   = {1--29},
  url     = {http://jmlr.org/papers/v18/17-492.html}
}