Shipments to the United States
Due to changes in U.S. customs regulations, all shipments to the United States are now subject to customs clearance.
This means that the recipient will be required to pay customs duties, as well as any applicable taxes and fees upon import.
Please also note that delivery may be delayed while the shipment is being processed by U.S. customs.
![Cover for Sergei V. Ketov · Quantum Non-linear Sigma-Models: From Quantum Field Theory to Supersymmetry, Conformal Field Theory, Black Holes and Strings - Theoretical and Mathematical Physics (Paperback Book) [Softcover reprint of hardcover 1st ed. 2000 edition] (2010)](https://imusic.b-cdn.net/images/item/original/885/9783642086885.jpg?sergei-v-ketov-2010-quantum-non-linear-sigma-models-from-quantum-field-theory-to-supersymmetry-conformal-field-theory-black-holes-and-strings-theoretical-and-mathematical-physics-paperback-book&class=scaled&v=1506102388)
![Cover for Sergei V. Ketov · Quantum Non-linear Sigma-Models: From Quantum Field Theory to Supersymmetry, Conformal Field Theory, Black Holes and Strings - Theoretical and Mathematical Physics (Hardcover Book) [2000 edition] (2000)](https://imusic.b-cdn.net/images/item/original/610/9783540674610.jpg?sergei-v-ketov-2000-quantum-non-linear-sigma-models-from-quantum-field-theory-to-supersymmetry-conformal-field-theory-black-holes-and-strings-theoretical-and-mathematical-physics-hardcover-book&class=scaled&v=1521034691)