  A theory is presented for tunneling between compressible regions on the sides
of a narrow incompressible Quantum Hall strip. Assuming that electron
interactions lead to formation of a Wigner crystal on the edges of the
compressible regions, we consider the situation when the non-conservation of
electron momentum required for transport is provided, in the absence of
disorder, by umklapp scattering on the crystal. The momentum given to the
crystal is quantized due to the Bragg condition, which leads to resonances in
tunneling conductivity as a function of the incompressible strip width, similar
to those reported recently by N. Zhitenev, M. Brodsky, R. Ashoori, and M.
Melloch.
