Number | Name | Date | Kind |
---|---|---|---|
2306626 | Huniger et al. | Dec 1942 | |
2400147 | Hooley | May 1946 | |
2413940 | Bickford | Jan 1947 | |
3525698 | Leto et al. | Aug 1970 | |
3634282 | Denis et al. | Jan 1972 | |
3746556 | Morgan | Jul 1973 |
Entry |
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Verstegen et al., "J. of Luminescence" 6, (1973). pp. 425-431. |