In 1903, Riazanov became the first writer to introduce the concept of permanent revolution to the political literature of Russian Marxism when he published three studies in Geneva under the title "Materials on the Program of the Workers' Party." Riazanov argued, in opposition to the views of G.V. Plekhanov, that the rise of capitalism in Russia represented a fundamental departure from the pattern seen elsewhere in Europe. The large size and centralization of Russian industrial firms suggested to Riazanov a relative weakness of Russian middle-classes and a significant possibility that there would be forces of the Russian Marxist movement which would lead the revolution against Tsarist autocracy and thenceforth immediately towards socialism.