def cross_reference(self, model: BDF) -> None:
"""
Cross links the card so referenced cards can be extracted directly
Parameters
----------
model : BDF()
the BDF object
"""
msg = ', which is required by CMASS3 eid=%s' % self.eid
self.nodes_ref = model.EmptyNodes(self.node_ids, msg=msg)
self.pid_ref = model.PropertyMass(self.pid, msg=msg)
