@article{CRMATH_2015__353_8_665_0,
     author = {Ba\v{s}i\'c, Bojan},
     title = {The {Heesch} number for multiple prototiles is unbounded},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {665--669},
     publisher = {Elsevier},
     volume = {353},
     number = {8},
     year = {2015},
     doi = {10.1016/j.crma.2015.05.002},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2015.05.002/}
}