R help - Jan 2014 - How does R determine best value of alpha in forecasting

Hi

I need to implement Holt-Winter's Exponential Smoothing in my project. I
was going through implementation of Holt-Winter's Exponential Smoothing in
forecast package. I would appreciate if someone can explain how R finds
best value of alpha and beta given the dataset. It ll be great if someone
can post the research-paper it uses to implement DSHW.

Thank You

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