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Reference for LAI12M and GREENFRAC (WPS4.0)

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I would like to ask what MODIS 30s products are being used in WPS (V4.0) for computing the LAI12M (MODIS LAI) and GREENFRAC (MODIS FPAR) in geo_em. I have been looking for the answer, and found this post in FAQ section ( but it seems like it does not refer to anything related to LAI and green vegetation fraction. The user's guide mentions that WPS uses MODIS-based LAI and green vegetation fraction but it does not provide much detail either.. Thank you in advance.

I believe LAI and FPAR are also derived from the same source data listed in the post
Unfortunately we don't have any publications related to static input data used by WPS.