TY - BOOK ID - 135391863 TI - Central extensions and physics AU - Tuynman, G. M. AU - Wiegerinck, W. A. J. J. PY - 1987 PB - Amsterdam University of Amsterdam. Department of mathematics DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:135391863 AB - ER -