Beginning from a critique of the idea that a characteristic thought pattern in Heraclitus is the geometrical proportion (proposed by Hermann Fraenkel and others), the author critically discusses the fragments on which that interpretation rests, and goes on to delineate several characteristic means of expression: Paradox, Folklore Motifs, Traditional Wisdom (proverbs), vivid Similes, and metrical forms. The author concludes by discussing the meaning of "logos" in Heraclitus.
Marcovich, Miroslav, "Some Heraclitean Problems" (1981). The Society for Ancient Greek Philosophy Newsletter. 38.