The real author:
Yuriy Tokman
This indicator was first implemented in MQL4 and published in Code Base on 07.01.2009.
The indicator uses SmoothAlgorithms.mqh library classes (must be copied to the terminal_data_folder\MQL5\Include). The use of the classes was thoroughly described in the article “Averaging price series for intermediate calculations without using additional buffers”.
Fig.1 The ytg_Price_Peak indicator