Doubly–Periodic Minimal Surfaces , how to make a surface, how to use the equaiton

Hello, i am trying to make Doubly–Periodic Minimal Surfaces, i have been able to make them by breaking them into parts and joining them, however, the M+ and M- are difficult to make and also is it possible to make them through equations. i am attaching the picture and a pdf that can help us.


may this help