Number | Date | Country | Kind |
---|---|---|---|
3217387 | May 1982 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3655689 | Singer | Apr 1972 | |
3822282 | Singer | Jul 1974 |
Number | Date | Country |
---|---|---|
1936157 | Sep 1970 | DEX |
Entry |
---|
Houben-Weyl, Methoden der organischen Chemie, vol. XIV/2, 4th Edition, Georg Thieme Verlag, Stuttgart 1963, pp. 61-70. |