  Extending the gauge-invariance principle for \tau functions of the standard
bilinear formalism to the supersymmetric case, we define N=1 supersymmetric
Hirota operators. Using them, we bilinearize SUSY KdV-type equations (KdV,
Sawada-Kotera, Hirota-Satsuma). The solutions for multiple collisions of
super-solitons and extension to SUSY sine-Gordon are also discussed.
