Hilbert Space Problem Book, Paul R. Halmos (1982, ISBN 978-0-387-90685-0) Fibre Bundles, Dale Husemoller (1994, 3rd ed., ISBN 978-0-387-94087-8) Linear
line systems based on the synchronous digital hierarchy for use on optical fibre cables G.959.1 光伝送網の物理インタフェース Optical transport network physical layer interfaces