Added Skrynnikov and Tollinger to the copyright notice in lib/dispersion/ns_cpmg_2site_star.py.
I can now see that the code derives from the funNumcpmg.m of the sim_all.tar file
(https://gna.org/support/download.php?file_id=18404) attached to https://gna.org/task/?7712#comment5.
This sim_all.tar file is the original code of Nikolai and Martin.
