4(美)Forgacs, RL,Evacustad Tube Transportation, Energy And The Environment, High Speed Ground Trans portation Journal Vol: 9 No:1,03/00/1975.
5Robert M Salter, Trans-Planetary Subway Systems:A Burgeoning Capability ,Rand Orgarization,http://www.rand.org.1978.
6(美)Patent 5950543,Evacuated tube transport, by Daryl Oster, September 14,1999.
7M Okano, T Iwamoto, S Fuchino, N Tamada, Feaabfity of A Goods Transportation System with A Superconducting Magnatic Lovitation Guide-Load Characteristics of A Magnetic Levitation Guide Using. A Bulk High-Tc Superconductor, Physica C 388(2003)500-505.