Looking for paper: generalization of LLM as probabilistic generation of tokens + validation

I can't find the paper but it's your of important to me.

It had the following content; * theoretical considerations of viewing LLM as way to probabilistic generate tokens * data flow of tokens was also considered, realized with nodes which can generate tokens or validate them * generalization of various "agentic" papers which did validation of result with LLM as data flow nodes to validate

I can remember two papers which did this sort of thing. I can't find neither of them. I am looking for the one paper which really did use nodes.