TSM algorithm from C2RCC processor

Hi, I have a question concerning the C2RCC processor to retirieve TSM concentration from a S2 L1C product.
I would like to know what’s the name of the algorithm that is used, I can’t find it anywhere. Thank you very much.

Actually the C2RCC is the algorithm.
Internally, it uses a neural net.

Additionally you can have a look at the ATBD I’ve linked here: