Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| <mark>Journal publication date</mark> | 23/06/1969 |
|---|---|
| <mark>Journal</mark> | Physical review letters |
| Issue number | 25 |
| Volume | 22 |
| Number of pages | 3 |
| Pages (from-to) | 1411-1413 |
| Publication Status | Published |
| <mark>Original language</mark> | English |