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| 999 |
_c169595 _d169594 |
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| 005 | 20230131113344.0 | ||
| 008 | 230131b ||||| |||| 00| 0 eng d | ||
| 082 |
_223 _a621.38105 _bELE |
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| 245 | _aElectronic Letters V.17(8) 1981 | ||
| 260 |
_a(S.l) _b(s.d) _c1981 |
||
| 362 | _a12-Jan Jan-11 Jun,1981 | ||
| 509 | _aNS | ||
| 942 | _cPRBP | ||