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these need links or they can't really be read |
These are treated as books instead of links to articles, like found in External Links section. There isn't any requirement on Wikipedia that mandates a book must be readable online! |
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==References==
{{Reflist}}
==Further reading==
* [http://www.rtca.org/store_product.asp?prodid=933 DO-181E Minimum Operational Performance Standards for ATCRBS / Mode S Airborne Equipment], RTCA
{{Aviation lists}}
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