@article{Lison_k_2014,
    doi = {10.1103/physreva.89.042101},
    url = {https://doi.org/10.1103%2Fphysreva.89.042101},
    year = {2014},
    month = {apr},
    publisher = {American Physical Society ({APS})},
    volume = {89},
    number = {4},
    author = {Petr Lison{\v{e}}k and Piotr Badzi{\c a}g and Jos{\'{e}} R. Portillo and Ad{\'{a}}n Cabello},
    title = {Kochen-Specker set with seven contexts},
    journal = {Physical Review A}
}

@article{Lison_k_2014, doi = {10.1103/physreva.89.042101}, url = {https://doi.org/10.1103%2Fphysreva.89.042101}, year = {2014}, month = {apr}, publisher = {American Physical Society ({APS})}, volume = {89}, number = {4}, author = {Petr Lison{\v{e}}k and Piotr Badzi{\c a}g and Jos{\'{e}} R. Portillo and Ad{\'{a}}n Cabello}, title = {Kochen-Specker set with seven contexts}, journal = {Physical Review A} }