There are a number of implementations of this method, the most notable are FGK (Faller-Gallager-Knuth) and Vitter algorithm.
Later, Robert G. Gallager (1978) and Donald Knuth (1985) proposed some complements and the algorithm became widely known as FGK (from the initials of each of the researchers).
In 1982, due to AT&T refusing to license the code, a development team led by Newton Faller decided to initiate the development of an alternative system, called Plurix (**), using as reference UNIX Version 7, the most recent at the time, that they had running on an old Motorola computer system.
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