Dear Researcher

please check these attachments and refer to it.it will be helpful for you.

Regards 

http://link.springer.com/article/10.1007/BF00420616

http://www.sciencedirect.com/science/article/pii/S2210832714000106

Which one of the following is a universal gate

 the complexity is occurrence due to the big structure which used  such as the rule and membership function. so the time is to take much to get optimal model