Humphreys P. Aleatory explanations. Synthese. 1981;48(2):225–232.

Demopoulos W. Locality and the algebraic structure of quantum mechanics. Studies in Foundations of Quantum Mechanics. 1980:119–144.

Humphreys P. Cutting the causal chain. Pacific Philosophical Quarterly. 1980;61(3):305–314.

Humphreys P. Probabilistic causality and multiple causation. In: PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association. Vols. 1980. Philosophy of Science Association; 1980. pp. 25–37.

Humphreys P. Is" Physical Randomness" Just Indeterminism in Disguise?. In: PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association. Vols. 1978. Philosophy of Science Association; 1978. pp. 98–113.

Humphreys P. Randomness, independence, and hypotheses. Synthese. 1977;36(4):415–426.