Chehelcheraghi M, van Leeuwen C, Steur E, Nakatani C (2017) A
neural mass model of cross frequency coupling. PLoS One

is available from a link in the above paper:

To run:

After downloading and expanding the archive type "Main" to start
Main.m on the matlab prompt.  After a few minutes graphs similar to
figure 6 in the paper appears: