I want to know the answer to the following question:
What are the names of two researchers who divided neolithic chronology into five periods?
All the background I'm provided with is that "They also advanced the idea of a transitional stage between the PPNA and PPNB between 8,800 and 8,600 BC at sites like Jerf el Ahmar and Tell Aswad.". Is that enough to answer the question?
Answer: no