1. Cramer, J.: The transactional interpretation of quantum mechanics. Rev. Mod. Phys. 58, 647–688 (1986)
2. Cramer, J.: An overview of the transactional interpretation. Int. J. Theor. Phys. 27, 227 (1988)
3. Cramer, J.: A Farewell to Copenhagen? Analog, December 2005
4. Nielsen, H.B.: Dual Strings. Fundamentals of quark models. In: Barbour, I.M., Davies, A.T. (eds.) Proc. of the Seventeenth Scott. Univ. Summer School in Physics, St. Andrews, August 1976, pp. 465–547. Univ. of Glasgow (publ. by the Scott.Univ. Summer School in Physics, 1977)
5. Nielsen, H.B.: Har vi brug for fundamentale naturlove (in Danish) (meaning: “Do we need laws of Nature?”). Gamma 36, 3–16 (1978) (1. part) and Gamma 37, 35–46 (1978) (2. part)