Mann, C. M., Matheson, D. N., Ellison, B. N., Oldfield, M. L., Moyna, B. P., Spencer, J. J., et al. (1998). On the design and measurement of a 2.5 THz waveguide mixer. In _Proc. 9<sup>th</sup> Int. Symp. Space Terahertz Technol._ (161).