We show that a new fundamental period Pf of dHvA oscillations, which appears along with other ``forbidden'' combination frequencies in a multi-band canonical Fermi-liquid, is very robust with respect to a finite smearing of Landau levels and a background of non-quantized states. We analyse the possibility of measuring small Fermi surface pockets with the use of the ``forbidden'' frequencies.
@article{arxiv.cond-mat/9611170,
title = {New Fundamental dHvA Frequency in Canonical Low-Dimensional Fermi Liquids},
author = {A. S. Alexandrov and A. M. Bratkovsky},
journal= {arXiv preprint arXiv:cond-mat/9611170},
year = {2009}
}