@article{10_37236_9782,
     author = {Molly Baird and Sara Billey and Erik Demaine and Martin Demaine and David Eppstein and S\'andor Fekete and Graham Gordon and Sean Griffin and Joseph Mitchell and Joshua  Swanson},
     title = {Existence and hardness of conveyor belts},
     journal = {The electronic journal of combinatorics},
     year = {2020},
     volume = {27},
     number = {4},
     doi = {10.37236/9782},
     zbl = {1451.52013},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/9782/}
}