TY - GEN AU - Lawrence, Jim C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1988-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.IR.88-3777 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1988 TI - Finite unions of closed subgroups of the n-dimensional torus: ER -