Computing turning points of curves implicitly defined by nonlinear equations depending on a parameter. - Gerd Pönisch; Hubert Schwetlick (Computing, 1981)

A quadratically convergent method for computing simple singular roots and its application to determining simple bifurcation points. - Reinhard Menzel; Gerd Pönisch (Computing, 1984)

Computing simple bifurcation points using a minimally extended system of nonlinear equations. - Gerd Pönisch (Computing, 1985)

Computing hysteresis points of nonlinear equations depending on two parameters. - Gerd Pönisch (Computing, 1987)

An indirect method for computing origins for Hopf bifurcation in two-parameter problems. - Gerd Pönisch (Computing, 1991)

Computing Multiple Pitchfork Bifurcation Points. - Gerd Pönisch; Uwe Schnabel; Hubert Schwetlick (Computing, 1997)