@article{Engelen_2000, title={H. Knap, Forschungsstelle Langeveld. Duits afluisterstation in bezet Nederland}, volume={115}, url={https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106056}, DOI={10.18352/bmgn-lchr.5275}, number={2}, journal={BMGN - Low Countries Historical Review}, author={Engelen, D.}, year={2000}, month={Jan.}, pages={345–347} }