Karl Hoffmann, 1989, "An introduction to measurements using strain gages", Hottinger Baldwin Messtechnik GmbH, Darmstadt, Germany, 290 pages, -, English |
Karsten Jakobsen, 1979, "Måling med strekklapper", Tapir, Trondheim, Norway, ISBN 82-519-0035-2 46 pages, 40 NOK, Norwegian |