References
- Zeller , RC and Pohl , RO . 1971 . Phys. Rev. B , 4 : 2029
- Phillips , WA . 1987 . Rep. Prog. Phys. , 50 : 1657
- Talón , C , Ramos , MA and Vieira , S . 2002 . Phys. Rev. B , 66 : 012201
- Rosenstock , HB . 1961 . Phys. Chem. Solids , 23 : 659
- Cotterill , RMJ , Jensen , RJ and Kristensen , WD . 1975 . J. Phys. Theor. Appl. , 36 : C2 et al.
- Fulde , P and Wagner , H . 1971 . Phys. Rev. Lett. , 27 : 1280
- Anderson , PW , Halperin , BI and Varma , CM . 1972 . Phil. Mag. , 25 : 1
- Phillips , WA and Low , J . 1972 . Temp. Phys. , 7 : 351
- Redfield , D . 1971 . Phys. Rev. Lett. , 27 : 730
- Takeno , S and Goda , M . 1972 . Prog. Theor. Phys. , 47 : 790
- Tanttila , WH . 1977 . Phys. Rev. Lett. , 39 : 554
- Zimmerman , J and Weber , G . 1981 . Phys. Lett. A , 86 : 32
- Courtens , E , Foret , M and Hehlen , B . 2001 . Sol. Stat. Commun. , 117 : 187 et al.
- Ashcroft , NW and Mermin , ND . 1976 . Solid State Physics , Philadelphia : Saunders College Publishing .
- Jankowiak , R and Small , GJ . 1988 . Phys. Rev. B , 37 : 8407
- Wilks , J . 1967 . The Physics of Liquid and Solid Helium , Oxford : Clarendon Press .
- Tilley , DR and Tilley , J . 1986 . Superfluidity and Superconductivity , Bristol : Adam Hilger .
- Griffin , A . 1993 . Excitations in a Bose-Condensed Liquid , Cambridge : Cambridge University Press .
- Gupta , PK . 1996 . J. Non-Cryst. Solids , 195 : 158
- Huang , K . 1987 . Statistical Mechanics, , 2nd edition , New York : Wiley .