Geodesic
Some Operations on Tolerances
Séminaire lotharingien de combinatoire, Tome 13 (1985) 
Flavio Bonetti; Nino Civolani. Some Operations on Tolerances. Séminaire lotharingien de combinatoire, Tome 13 (1985). http://geodesic.mathdoc.fr/item/SLC_1985_13_a4/
@article{SLC_1985_13_a4,
     author = {Flavio Bonetti and Nino Civolani},
     title = {Some {Operations} on {Tolerances}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1985},
     volume = {13},
     url = {http://geodesic.mathdoc.fr/item/SLC_1985_13_a4/}
}
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AU  - Flavio Bonetti
AU  - Nino Civolani
TI  - Some Operations on Tolerances
JO  - Séminaire lotharingien de combinatoire
PY  - 1985
VL  - 13
UR  - http://geodesic.mathdoc.fr/item/SLC_1985_13_a4/
ID  - SLC_1985_13_a4
ER  - 
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%A Flavio Bonetti
%A Nino Civolani
%T Some Operations on Tolerances
%J Séminaire lotharingien de combinatoire
%D 1985
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%U http://geodesic.mathdoc.fr/item/SLC_1985_13_a4/
%F SLC_1985_13_a4

Voir la notice de l'acte provenant de la source Séminaire Lotharingien de Combinatoire website

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.