JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 22, page. 435 - 446, 1989-12
APPLIED PHYSICS LETTERS, vol. 55, no. 17, page. 1768 - 1770, 1989-10-23
IEEE TRANSACTIONS ON PLASMA SCIENCE, vol. 16, no. 1, page. 27 - 38, 1988-02