^Hopper, A.; Jones, A.; Augur, R. A.; Fice, M. J.; Blythe, S.; Ahmed, H. (1992). "A feasibility study for the fabrication of planar silicon multichip modules using electron beam lithography for precise location and interconnection of chips". IEEE Transactions on Components, Hybrids, and Manufacturing Technology. 15: 97–102. doi:10.1109/33.124197.
^Wharam, D. A.; Thornton, T. J.; Newbury, R.; Pepper, M.; Ahmed, H.; Frost, J. E. F.; Hasko, D. G.; Peacock, D. C.; Ritchie, D. A.; Jones, G. A. C. (1988). "One-dimensional transport and the quantisation of the ballistic resistance". Journal of Physics C: Solid State Physics. 21 (8): L209. Bibcode:1988JPhC...21L.209W. doi:10.1088/0022-3719/21/8/002.
^Thornton, T.; Pepper, M.; Ahmed, H.; Andrews, D.; Davies, G. (1986). "One-Dimensional Conduction in the 2D Electron Gas of a Ga As-Al GaAs Heterojunction". Physical Review Letters. 56 (11): 1198–1201. doi:10.1103/PhysRevLett.56.1198. PMID10032595.