Lars Heide. From Invention to Production: The Development of Punched-card Machines by F. R. Bull and K. A. Knutsen 1918-1930. IEEE Annals of the History of Computing, 13(3):261-272, 1991. [doi]
@article{Heide91,
title = {From Invention to Production: The Development of Punched-card Machines by F. R. Bull and K. A. Knutsen 1918-1930},
author = {Lars Heide},
year = {1991},
doi = {10.1109/MAHC.1991.10024},
url = {http://doi.ieeecomputersociety.org/10.1109/MAHC.1991.10024},
researchr = {https://researchr.org/publication/Heide91},
cites = {0},
citedby = {0},
journal = {IEEE Annals of the History of Computing},
volume = {13},
number = {3},
pages = {261-272},
}