Question: What philosophy was combined with socialism and nationalism to form Third International Theory?
Sentence: He described his approach to economics as "Islamic socialism", although biographers Blundy and Lycett noted that Gaddafi's socialism had a "curiously Marxist undertone", with political scientist Sami Hajjar arguing that Gaddafi's model of socialism offered a simplification of Karl Marx and Friedrich Engels' theories.
Answer in sentence: no