putnam - is the causal structure of the physical itself something physical?

H.Putnam "Is the Causal Structure of the Physical Itself Something Physical?" // P. French, T.E. Uehling, Jr., H. Wettstein (eds.) "Midwest Studies in Philosophy IX: Causation and Causal Theories". Minneapolis: University of Minnesota Press, 1984, pp. 3-16.

bontly - what is an empirical analysis of causation?

D.Bontly "What is an Empirical Analysis of Causation?", Synthese (2006), Vol. 151, No. 2, pp. 177-200.