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http://www.springerlink.de/content/561l247724200117/?p=073270b446ee49a984efd51c894772ad&pi=6
Journal Il Nuovo Cimento D
ISSN 0392-6737 (Print) 1826-9893 (Online)
Issue Volume 1, Number 1 / January, 1982
DOI 10.1007/BF02450184
Pages 41-48