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Forward/reverse median filter. Reference needed

I am using the double median filtering of my data. For this, I perform median filtering of the signal in forward direction, then in reverse direction (from end to start). Results are averaged. Example ...
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What is a “Hampel Filter” and how does it work?

One of the new functions in the MATLAB Signal Processing toolbox for R2015b is the Hampel Filter. It appears to be used for outlier removal and from the examples, it looks like it might do a better ...