Afterwards, the theory of "post-totalitarianism" was expanded upon by political scientist Juan Linz.
Biogenetic structural theory was expanded in the 1990s in order to account for how the human brain and mind may interact directly with the quantum universe.
Later on the theory was expanded in electro-sonic, hydro-sonic, sonostereo-sonic and thermo-sonic.
John Duckitt suggests that the theory be expanded to include competition between groups of unequal status.
The theory, along with its implications for democracy, was expanded upon by Caplan in his book The Myth of the Rational Voter.
His theories in Pyramidology were then expanded by Charles Piazzi Smyth.
His theory was expanded by John R. P. French who related it to organizational and industrial settings.
Since Marx's time, the theory has been modified and expanded by thousands of Marxist thinkers.
His theory of the nature of matter and energy was expanded upon in his book The Evolution of Matter.
The theory of neuron integration and firing (response to inputs) is therefore expanded by accounting for the nonideal conditions of cell structure.
