Cooling of neutron stars: effects of accreted envelopes, magnetic field   and crustal superfluidity
  We briefly review recent theoretical studies of the effects of accreted envelopes, magnetic fields and crustal superfluidity on the cooling of neutron stars. These effects are especially important for slowly cooling low-mass neutron stars, where direct Urca process of neutrino emission is forbidden. The effects are useful for interpretation of observations of several isolated middle-aged neutron stars. 
G. Chabrier (Ecole Normale Sup\'erieure de Lyon), A. Y. Potekhin and   D. G. Yakovlev (Ioffe Physico-Technical Institute)