1. A German machine for differencing and testing additives. Issue 3 (4th May 2017) Authors: Alexander, John; Gallehawk, John; Jackson, John; Pearce, Allen; Simpson, Edward Journal: Cryptologia Issue: Volume 41:Issue 3(2017) Page Start: 269 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗