TY - BOOK TI - Flips for 3-folds and 4-folds SN - 9780198570615 | 9780191717703 (ebook) | 0191717703 (ebook) : PY - 2007/// CY - Oxford PB - Oxford University Press UR - http://dx.doi.org/10.1093/acprof:oso/9780198570615.001.0001 ER -