1. Arahovitis, J.: Multivalued linear mappings and matrices,Math. Balkanica 3 (1973), 3?8.
2. Artstein, Z.: On the calculus of set-valued functions,Indiana Univ. Math. J. 24 (1974), 433?441.
3. Artstein, Z.: Piecewise linear approximations of set-valued maps,J. Approx. Theory 56 (1989), 41?45.
4. Artstein, Z.: First order approximations for differential exclusions,Set-Valued Anal. 2 (1994), 7?17.
5. Aubin, J.-P.: Contingent derivatives of set-valued maps and existence of solutions to non-linear inclusions and differential inclusions, in L. Nachbin (ed.),Mathematical Analysis and Applications, Academic Press, New York, 1981, pp. 159?229.