Brouwer, A.E., Cohen, A.M., and Neumaier, A. Distance-Regular Graphs. Springer-Verlag, Berlin, 1989.
Delta Air Lines | Greyhound Lines | Eastern Air Lines | Outside the Lines | Ellerman Lines | Carnival Cruise Lines | Peter Pan Bus Lines | Korean Air Lines Flight 007 | Trans-Canada Air Lines Flight 810 | Trans-Canada Air Lines | Liverpool to Manchester Lines | Driver: Parallel Lines | Blue Lines | American President Lines | Peter Lines | Farrell Lines | Blurred Lines | Behind Enemy Lines | Swiss International Air Lines | Source lines of code | Snow Hill Lines | Nazca Lines | Moby Lines | Fraunhofer lines | China Shipping Container Lines | Bonanza Air Lines | Bibb v. Navajo Freight Lines, Inc. | Behind Enemy Lines (2001 film) | Aegean Speed Lines | 'widened lines' |