The pdf file (downloable through the links underneath) is the presentation of a 2-part series of lectures for students of economic departments that have no prior knwoledge (or at least a concise background) in Marxist economic analysis. As such it offers a simplified, but consistent to Marxian analysis, presentation of Marx’s theory of economic crises and its relation to the other major economic perspectives.
Marx and the theory of economic crisis
https://www.academia.edu/34796299/Marx_and_the_theory_of_economic_crisis