Read access to user's nodes based for referenced users
That will require custom code.

Here's one way to achieve it:

You'll need to use hook_node_view to get involved when the node is about to be rendered.  Your code should:


Check the node's author and use user_load to gain access to the referenced users
Check to see if the current user (global $user) is in the list of referenced users
Permit or deny the node view, or change how the node displays, depending on the result.