P. Pylkkänen, B. J. Hiley, I. Pättiniemi: Bohm's approach and Individuality, arXiv:1405.4772v3, version 3 of 28 November 2014
bbk.ac.uk
F. A. M. Frescura, B. J. Hiley: Algebras, quantum theory and pre-space, pp. 3–4 (published in Revista Brasileira de Fisica, Volume Especial, Julho 1984, Os 70 anos de Mario Schonberg, pp. 49–86)
David Bohm: Time, the implicate order, and pre-space, In: David R. Griffin: Physics and the Ultimate Significance of Time, State University of New York Press, 1986, ISBN0-88706-113-3, pp. 177–208, p. 183
David Bohm: Time, the implicate order, and pre-space, In: David R. Griffin: Physics and the Ultimate Significance of Time, State University of New York Press, 1986, ISBN0-88706-113-3, pp. 177–208, p. 189
David Bohm: Time, the implicate order, and pre-space, In: David R. Griffin: Physics and the Ultimate Significance of Time, State University of New York Press, 1986, ISBN0-88706-113-3, pp. 177–208, pp. 192–193