Electronic Properties in Semiconductor Heterostructures; L.J. Sham. Phonons in Low-Dimensional Systems; J.D. White, G. Fasol. Theory of Electron Transport in Low-Dimensional Semiconductor Structures; P.N. Butcher. Quantum Wires and Quantum Dots; F. Stern. Quantum Interference in Disordered Electron Systems; G. Bergmann. Theory of the Quantum Hall Effect; N. d'Ambrumenil. Tunneling in Semiconductor Resonant Structures; G. García-Calderón. Keldysh Formalism and the LandauerBüttiker Approach; S. Datta. Magneto-Optical Properties of Semiconductor Heterostructures; J.C. Maan. Electrons in Superlattices; G.H. Döhler. Metallilc Superlattices; D. Kerkmann, D. Pescia. Phonon Emission, Absorption, and Reflection from a Two-Dimensional Electron Gas; L.J. Challis. Quantum Adiabatic Electron Transport in Ballistic Conductors; L.P. Kouwenhoven. Experiments on Two-Dimensional Wigner Electron Crystals; E.Y. Andrei. Artificial Structures; F. Beltram, F. Capasso. Index.