@article{Ba_i__2021,
    doi = {10.1007/s00283-020-10034-w},
    url = {https://doi.org/10.1007%2Fs00283-020-10034-w},
    year = {2021},
    month = {jan},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {43},
    number = {3},
    pages = {50--53},
    author = {Bojan Ba{\v{s}}i{\'{c}}},
    title = {A Figure with Heesch Number 6: Pushing a Two-Decade-Old Boundary},
    journal = {The Mathematical Intelligencer}
}

@article{Ba_i__2021, doi = {10.1007/s00283-020-10034-w}, url = {https://doi.org/10.1007%2Fs00283-020-10034-w}, year = {2021}, month = {jan}, publisher = {Springer Science and Business Media {LLC}}, volume = {43}, number = {3}, pages = {50--53}, author = {Bojan Ba{\v{s}}i{\'{c}}}, title = {A Figure with Heesch Number 6: Pushing a Two-Decade-Old Boundary}, journal = {The Mathematical Intelligencer} }