Theory of three-electrone bond in the four works with brief comments

The three-electron theory of bond accepted for granted the existence of three-electron bonds (one axiom), everything else is derived logically. And if think... reflect the existence of three-electron bond directly from the theory of resonance (resonance structures do not exist, in reality there is something average between them - and now think that should really be the basis of this, some real structure?.. of course the three-electron bond!!!).