Sommaire du Fascicule no. 2
p. 236-254
Sommaire du Fascicule no. 4
The coordinate ring of an $n$-dimensional sphere and some examples of differentially simple algebras
p. 416-434
Sommaire du Fascicule no. 5
p. 559-581
p. 582-588
p. 589-600
p. 606-631
p. 632-637
p. 642-645
p. 646-647