1. Anderson, C.-R., Coker, D.F., Eckert, J., Bug, A.L.R.: Computational study of molecular hydrogen in zeolite Na-A. 1. Potential energy surfaces and thermodynamic separation factors for ortho and para hydrogen. J. Chem. Phys. 111, 7599–7613 (1999)
2. Anwar, M.S.: NMR quantum information processing with para-hydrogen, Ph.D. thesis, University of Oxford, UK (2004)
3. Baker, C.R., Shaner, R.L.: A study of the efficiency of hydrogen liquefaction. Int. J. Hydrogen Energy 3, 321–334 (1978)
4. Barrett, P.A., Stephenson, N.A.: Adsorption properties of zeolites, zeolites and ordered porous solids: Fundamentals and applications. In: Martinez, C., Perez-Pariente, J. (eds.) Universidad Politecnica de Valencia, Valencia, pp. 67–90 (2011)
5. Barrett, P.A., Stephenson, N.A., Pontonio, S.J.: Gas separation adsorbents and manufacturing method. US Patent 2006082087 (2006)