Critical exponents for the metal-insulator transition of ^{70}Ge:Ga in   magnetic fields
  We have measured the electrical conductivity of nominally uncompensated ^{70}Ge:Ga samples in magnetic fields up to B=8 T at low temperatures (T=0.05-0.5 K) in order to investigate the metal-insulator transition in magnetic fields. The values of the critical exponents in magnetic fields are consistent with the scaling theories. 
Michio Watanabe, Kohei M. Itoh, Masashi Morishita, Youiti Ootuka,   Eugene E. Haller