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Köhler, Rüdeger; Alessandro Tredicucci; Fabio Beltram; Harvey E. Beere; Edmund H. Linfield; A. Giles Davies; David A. Ritchie; Rita C. Iotti; Fausto Rossi (2002). "Terahertz semiconductor-heterostructure laser". Nature. 417 (6885): 156-159. Bibcode:2002Natur.417..156K. doi:10.1038/417156a. PMID12000955.
Lee, Alan W. M.; Qi Qin; Sushil Kumar; Benjamin S. Williams; Qing Hu; John L. Reno (2006). "Real-time terahertz imaging over a standoff distance (>25 meters)". Appl. Phys. Lett. 89 (14): 141125. Bibcode:2006ApPhL..89n1125L. doi:10.1063/1.2360210.
Köhler, Rüdeger; Alessandro Tredicucci; Fabio Beltram; Harvey E. Beere; Edmund H. Linfield; A. Giles Davies; David A. Ritchie; Rita C. Iotti; Fausto Rossi (2002). "Terahertz semiconductor-heterostructure laser". Nature. 417 (6885): 156-159. Bibcode:2002Natur.417..156K. doi:10.1038/417156a. PMID12000955.