I want to know the answer to the following question:
Who reconstructed Middle Chinese spoken from the 7th century to the 10th century?
All the background I'm provided with is that "In the Middle Chinese spoken during that period, as reconstructed by William H. Baxter, 土番 was pronounced thux-phjon and 吐蕃 was pronounced thux-pjon (with the x representing tone).". Is that enough to answer the question?