Séminaire Lotharingien de Combinatoire, B13e (1985).
[Formerly: Publ. I.R.M.A. Strasbourg, 1986, 316/S-13, p.
Flavio Bonetti and Nino Civolani
Some Operations on Tolerances
Studied are conditions in order that the result of an operation
(intersection, union, composition) on tolerances be a partition
or a partial plane.
The paper has been finally published under the title "On the
product of two tolerances" in
Ann. Univ. Ferrara Sez. VII (N.S.) 33 (1987), 189-205.