Original research and Wikipedia article on the subject matter [1], [2]:<p>[1] Links Between Cantonese and Ancient Middle Chinese:<p><a href="https://docs.google.com/document/d/1QpSyis7k9ls0hECCsf5lHqtRw3COvOIK/mobilebasic" rel="nofollow">https://docs.google.com/document/d/1QpSyis7k9ls0hECCsf5lHqtR...</a><p>[1] Middle Chinese:<p><a href="https://en.wikipedia.org/wiki/Middle_Chinese" rel="nofollow">https://en.wikipedia.org/wiki/Middle_Chinese</a>