Baryshev, A., Baselmans, J. J. A., Reker, S. F., Hajenius, M., Gao, J. R., Klapwijk, T. M., et al. (2005). Direct detection effect in hot electron bolometer mixers. In _Proc. 16th Int. Symp. Space Terahertz Technol._ (pp. 463–464).