When making relations of my contribution to the work of others, I sometimes deliberately want to avoid detailed description of the related work and state: "For details on derivation, see the original work." However, I'm not sure if the term original is appropriate here, and I kindly ask you to provide some alternatives. Or, is the term actually the most appropriate?
One alternative is seminal.
You would use this word to note that a text that has influenced your work has primacy in the field.
For details on game theory, see John Nash's seminal text "XXX".