LOGIC

Are there tautologies in ternary logic?

We all know about tertium non datur in boolean logic and other tautologies, but if we have a third value in ternary logic (e.g. "indeterminate") do these tautologies still exist?

(phi or not phi) can evaluate to indeterminate and true
(phi and not phi) can evaluate to indeterminate and false

so I guess all boolean tautologies don't apply to ternary logic.