@article{karvonen:biproducts,
  title={Biproducts without pointedness},
  author={Karvonen, Martti},
  journal={Cahiers de topologie et g{\'e}om{\'e}trie diff{\'e}rentielle cat{\'e}goriques},
  year={2020},
  volume={61},
  number={3},
  pages={229--238}
}