1. J. W. Mark, A 650-mm Long Liquid Hydrogen Target for Use In a High Inten-sity Electron Beam in “Advances in Cryogenic Engineering, Vol 29” Plenum Press, New York (1984), pl033.
2. J. W. Mark and W. B. Pierce, Hydrogen Targets at SLAC, IEEE Trans. On Nucl. Sci., NS-18: 806 (1971).