Ori,Amos:
Must Time Machine Construction Violate the Weak Energy Condition?
Physical Review Letters 71,1993, 2517-2520
Ori,Amos:
A New Time Machine Model With Compact Vacuum Core
Physical Review Letters 95,2005,021101,
Overseth, O.E.
Experiments in Time Reversal
Scientific American, Vol.221, No.4, October 1969, 89-101
Park, David
Should Physicists Say That the Past Really Happened?
In: Time and Mind The Study of Time VI , Ed.J.T.Fraser, International Universities Madison 1989 , 125-139