Because researchers from TRIUMF (Canada's National Laboratory for Particle and Nuclear Physics) were involved... of course... so were researchers from Fermilab, and other institutions... but the article was submitted by a Canadian.
Actually, There are about five free, unicode fonts that I know of for Tibetan and Dzongkha. Both Windows and Linux support these fonts, and many traditional texts have been typed in unicode. (OSX has a small problem, from what I've heard).
There are two produced by Chris Fynn TibetanMachineUnicode from THDL, and Jomolhari. Both UChen fonts.
CTRC produces four fonts (1 UChen and three Ume): CTRC-Uchen, CTRC-Tsumachu, CTRC-Betsu and CTRC-Drutsa
Additionally, Nithartha has made a proprietary unicode complying font called Sambhota.
There are also several legacy font systems which use several font files with prestacked characters and input programs.
This link http://www.aerifal.cx/~dalias/bodyig/fonts/ should give plenty more examples.
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