APPLIED SUPERCONDUCTIVITY, vol. 6, no. 10-12, page. 809 - 815, 1998-10
JETP LETTERS, vol. 67, no. 12, page. 1029 - 1033, 1998-06-25
SOLID STATE COMMUNICATIONS, vol. 105, no. 1, page. 25 - 29, 1998-01