Sharepoint 2013 load balancing between WPFs

Hi everybody!

I create a tree tier sharepoint 2013 farm.

How can I implement load balancing between two WPF without use of NLB or physical load balancer??

Is there any way that sharepoint 2013 support load balancing or redundancy itself??

Would you refer me to some articles about this subjects??

Did the Request Management Service in Sharepoint 2013 implement load balancing?

Thanks in advance!