Richard Blute, J. Robin B. Cockett, R. A. G. Seely. ! and ? - Storage as Tensorial Strength. Mathematical Structures in Computer Science, 6(4):313-351, 1996.
@article{BluteCS96, title = {! and ? - Storage as Tensorial Strength}, author = {Richard Blute and J. Robin B. Cockett and R. A. G. Seely}, year = {1996}, researchr = {https://researchr.org/publication/BluteCS96}, cites = {0}, citedby = {0}, journal = {Mathematical Structures in Computer Science}, volume = {6}, number = {4}, pages = {313-351}, }