W. Biernacki et Jl. Cieslinski, A compact form of the Darboux-Backlund transformation for some spectral problems in Clifford algebras, PHYS LETT A, 288(3-4), 2001, pp. 167-172
We derive a new formula for the Darboux matrix under the assumption that th
e square of the Darboux matrix vanishes for some values of the spectral par
ameter. The motivation and main application for this approach is a recently
introduced class of spectral problems in Clifford algebras. As an example,
we consider isothermic surfaces. (C) 2001 Elsevier Science B.V. All rights
reserved.