Source analysis using SEEG

I need to do the source analysis of the signal obtained with SEEG electrodes. How can I do it? Any paper or other type of document? How long the EEG signal must be to do the analysis?

There a fledging series of threads on this forum discussing source mapping from intracranial electrodes - please consult e.g.,

Signal duration does not affect source mapping, only your ability to identify signal components of interest, which by definition, depend on your research question.