Final published version, 629 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Journal publication date | 16/12/1974 |
---|---|
Journal | Physical review letters |
Issue number | 25 |
Volume | 33 |
Number of pages | 4 |
Pages (from-to) | 1468-1471 |
Publication Status | Published |
Original language | English |