Brasseur, R., Schanck, A., Delplace, B., & Debaetselier, A. (1987). A Proposed Mechanism Underlying the Process of Ca-2+-mediated Transfer of Dna Across Biological-membranes. Bioelectrochemistry and Bioenergetics, 17(1), 111-117. https://doi.org/10.1016/0302-4598(87)80013-2 (Original work published 1987)