Generalized Hooke Law for Relativistic Membranes and p-branes
  The character of elastic forces of relativistic membranes and $p$-branes
encoded in their nonlinear equations is studied. The toroidal brane equations
are reduced to the classical equations of anharmonic elastic media described by
monomial potentials. Integrability of the equations is discussed and some of
their exact solutions are constructed.
