Creating Lookup or Foreign key fields via REST in sharepoint 2013

Hello,

I am developping an AIR client software to use Sharepoint 2013 lists

I succeeded the following with POST requests with JSON:

• create a list
• create fields in the list

But I don't know how to create either:

• lookup fields
• foreign key fields

This is to create 1:N or N:1 or N:N relationships between Sharepoint lists to have database integrity mechanisms.

Thanks for advice/links/code

Bruce