p=n+1? works also p<n

In GitLab by @trettin1 on Jul 4, 2017, 14:39

In the code of spotpy, file sceua.py, 167, you'll find the advice: "ngs: int number of complexes (sub-populations), take more then the number of analysed parameters." Increasing the number of complexes increase also computing time. It is not necessary to have more complexes as parameters. p=n works very well, also p=n-1. Maybe, someone finds the literature source of p=n+1?