Number | Date | Country | Kind |
---|---|---|---|
8701252 | May 1987 | NLX |
Number | Name | Date | Kind |
---|---|---|---|
3829729 | Westlund, Jr. et al. | Aug 1974 | |
4084112 | Hebert et al. | Apr 1978 | |
4499404 | Walsh | Feb 1985 |
Entry |
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The American Heritage Dictionary, (2nd Ed.), (1982), pp. 513, 1051-1052. |
Handbook of Chemistry and Physcia (52nd Ed.) (1971-2), pp. 13-21. |