Philip Marks, Frode Weierud. Recovering the Wiring of Enigma's Umkehrwalze A. Cryptologia, 24(1):55-66, 2000. [doi]
@article{MarksW00,
title = {Recovering the Wiring of Enigma's Umkehrwalze A},
author = {Philip Marks and Frode Weierud},
year = {2000},
doi = {10.1080/0161-110091888781},
url = {http://dx.doi.org/10.1080/0161-110091888781},
researchr = {https://researchr.org/publication/MarksW00},
cites = {0},
citedby = {0},
journal = {Cryptologia},
volume = {24},
number = {1},
pages = {55-66},
}