Real author:
Vladimir Kravchuk "New Adaptive Method of Following the Tendency and Market Cycles"
Fast Trend Line Momentum (FTLM) and Slow Trend Line Momentum (SLTM) indicators show the rate of price change, FATL and SATL are calculated the similar way as Momentum indicator:
FTLM(bar) = FATL(bar) – RFTL(bar)
STLM(bar) = SATL(bar) – RSTL(bar)
where:

Coefficients of FATL and RFTL digital filters
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Coefficients of SATL and RSTL digital filters
The main difference FTLM from the classic Momentum indicator is the following: it uses the close prices, processed by digital fiters instead of close prices itself. As a result, FTLM looks smoothed and regular, in contrast with classic Momentum technical indicator.

Translated from Russian by MetaQuotes Software Corp.
Original code: http://www.mql5.com/ru/code/407