4f-elektronijärjestelmien uudet järjestetyt faasit ja kvanttikriittisyys korkeissa magneettikentissä ja ultramatalissa lämpötiloissa. Many strongly correlated electron systems develop ordered phases at low temperatures that can be well understood in terms of an electronic order parameter. At ultra-low temperatures, however, the (hyperfine) interaction between nuclei and electrons becomes increasingly important, and we have to consider how this affects ordered phases and phase transitions close to zero temperature. Dimensiot 24 ¤ 17 cm. Kuvitettu.