"A Mass Term for Three-Dimensional Gauge Fields," Nucl. Phys. B 185 (1981) 157. [168] J. Koller, "A Six-dimensional Superspace Approach To Extended Superfields," Nucl. Phys. B 222 (1983) 319. [169] P. S. Howe, G. Sierra and P. K. Townsend, "Supersymmetry in Six-Dimensions," Nucl. Phys. B 221 (1983) 331.