1. Allgower, E., Böhmer, K.: Resolving singular nonlinear equations. Rocky Mountain Journal of Mathematics,18, 225–268 (1988).
2. Allgower, E., Böhmer, K., Georg, K., Miranda, R.: Exploiting symmetry in boundary element methods. SIAM J. Numer. Anal.29, 534–552 (1991).
3. Allgower, E., Böhmer, K., Golubitsky, M. (eds.): Symmetry and bifurcations: cross influences between mathematics and applications (Marburg, 1991), ISNM. Basel, Boston: Birkhäuser 1992.
4. Allgower, E., Böhmer, K., Hoy, A., Janovsky, V.: Newton-like methods for singular points of nonlinear systems (in preparation).
5. Allgower, E., Böhmer, K., Mei, Z.: On new bifurcation results for semilinear elliptic equations with symmetries. In: Whiteman, J. R. (ed.) The mathematics of finite elements and applications VII, pp 487–494. London New York: Academic Press 1991.