Came across this 2 parter on Academia that may be of interest to some ifnot seen before.
https://www.academia.edu/5665264/Han_and_Xiongnu_A_Reexamination_of_Cultural_and_Political_Relations_I_
https://www.academia.edu/5659378/Han_and_Xiongnu_A_Reexamination_of_Cultural_and_Political_Relations_II_