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<ref name="DFS_2000">{{cite web |title=Single Gillham code |author-first=Marc |author-last=D. F. S. |date=2000-11-27 |publisher=ForPilots |url=http://www.forpilots.com/archive/rec.aviation.owning/5/msg5377.htm |access-date=2018-01-17 |url-status=dead |archive-url=https://web.archive.org/web/20180117174656/http://www.forpilots.com/archive/rec.aviation.owning/5/msg5377.htm |archive-date=2018-01-17}}</ref>
<ref name="LG_1955-06-03">{{London Gazette |issue=40497 |date=1955-06-03 |publisher=[[Her Majesty's Stationery Office]] |startpage=3257 |endpage=3296 |pages=3267, 3272, 3274 |supp=y |quote=[…] CENTRAL CHANCERY OF THE ORDERS OF KNIGHTHOOD. […] ''St. James's Palace, S.W.''1. […] ''9th June'', 1955. […] The QUEEN has been graciously pleased, on the occasion of the Celebration of Her Majesty's Birthday, to give orders for the following promotions in, and appointments to, the Most Excellent Order of the British Empire:— […] To be Ordinary Members of the Civil Division of the said Most Excellent Order:— […] Ronald Lionel GILLHAM, Esq., Signals Officer, Air Navigational Services, Ministry of Transport and Civil Aviation. […]}} [https://web.archive.org/web/20200518094510/https://www.thegazette.co.uk/London/issue/40497/supplement/3267][https://web.archive.org/web/20200518095002/https://www.thegazette.co.uk/London/issue/40497/supplement/3272][https://web.archive.org/web/20200518095002/https://www.thegazette.co.uk/London/issue/40497/supplement/3274]</ref>
<ref name="Dokter_1973">{{cite book |title=Digital Electronics |author-first1=Folkert |author-last1=Dokter |author-first2=Jürgen |author-last2=Steinhauer |chapter= |date=1973-06-18 |series=Philips Technical Library (PTL) / Macmillan Education |publisher=[[The Macmillan Press Ltd.]] / [[N. V. Philips' Gloeilampenfabrieken]] |edition=Reprint of 1st English |___location=Eindhoven, Netherlands |sbn=333-13360-9 |isbn=978-1-349-01419-4 |doi=10.1007/978-1-349-01417-0 |pages=32, 39, 50–53 |chapter-url=2.4. Coding numbers in the binary system |url=https://books.google.com/books?id=hlRdDwAAQBAJ |access-date=2020-05-11 |url-status=live |archive-url= |archive-date= <!-- |quote-page=53 -->|quote=[…] The [[Datex code]] […] uses the [[O'Brien code II]] within each decade, and reflected decimal numbers for the decimal transitions. For further processing, code conversion to the natual decimal notation is necessary. Since the O'Brien II code forms a [[9s complement]], this does not give rise to particular difficulties: whenever the code word for the tens represents an odd number, the code words for the decimal units are given as the 9s complements by inversion of the fourth binary digit. […]}} (270 pages) (NB. This is based on a translation of volume
<ref name="IEEE_1983">{{cite journal |title=1983 Pioneer Award |journal=[[IEEE Transactions on Aerospace and Electronic Systems]] |volume=AES-19 |number=4 |date=July 1983 |publisher=[[IEEE]] |pages=648–656 |url=https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4102842 |access-date=2020-05-16 |url-status=live |archive-url=https://web.archive.org/web/20200516153346/https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4102842 |archive-date=2020-05-16 |quote=[…] The Pioneer Award Committee of the IEEE Aerospace and Electronic Systems Society has named […] Allan Ashley […] Joseph E. Her[r]mann […] James S. Perry […] as recipients of the 1983 Pioneer Award in recognition of the highly significant contributions made by them. "FOR ADVANCING THE STATE OF THE ART OF VOICE AND DATA RADIO COMMUNICATIONS AND ELECTRONICS" The Award was presented at NAECON on May 18, 1983. […] Being aware of developments within the United States and shortly before the ICAO VII COM [in January 1962], the U.K. delegates proposed a compromise code to the United States which quantized altitude in 500 ft steps for a range of 64000 ft by employing a conventional Gray code with a 2.9 µs pulse spacing in the return message, and in a compatible manner subdivided further by 100 ft increments with a 1.45 µs pulse spacing in the return message […] A quick look at the U.K. proposal concluded that the United States could live with the U.K. compromise although greater circuit complexity resulted for coding and decoding. It is to the credit of the U.S. delegation to the ICAO VII COM, and as a result of the advice of Ashley, Herrmann, Perry, and others, that the acceptance of the compatible U.K. proposal was seen as offering a means of obtaining timely agreement on 100 ft increment reportings o that future air traffic control systems could be developed with automatic three dimensional data acquisition. A potential impasse in ICAO was averted, leaving nations free to choose between 100 ft and 500 ft increments of altitude reporting. […]}} (9 pages)</ref>
<ref name="Ashley_1961">{{cite journal |title=Code Configuration for Automatic Altitude Reporting via ATCRBS |author-first=Allan |author-last=Ashley |journal=IRE Transactions on Aerospace and Navigational Electronics |publisher=[[Institute of Radio Engineers]] |volume=ANE-8 |issue=4 |date=December 1961 |pages=144–148 |issn=0096-1647 |eissn=2331-0812 |doi=10.1109/TANE3.1961.4201819 |___location=Melville, New York, USA}} (5 pages)</ref>
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