Number | Date | Country | Kind |
---|---|---|---|
58-237669 | Dec 1983 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3105901 | Ladell et al. | Oct 1963 | |
3499736 | Zwaneburg | Mar 1970 |
Number | Date | Country |
---|---|---|
174598 | Oct 1984 | JPX |
Entry |
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Van Dijk et al., Jl of Crystal Growth vol. 21, 1974 pp. 310-312. |