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| 1 | 4/2001 .. | | | " " | | | . , . . . . | | |  |
| 2 | 4/2001 .. | | | " " | | | , , , . . | | |  |
| 3 | 4/2001 .. | | | " " | | | 20 "Nature", , . , , , - . | | |  |
| 4 | 4/2001 .. | | | " " | | | , . , . , . | | |  |
| 5 | 4/2001 .. | | | " " | | | , , , . - , . , . | | |  |
| 6 | 4/2001 .. | | | " " | | | , , . . | | |  |
| 7 | 4/2001 .. | | | " pH" | | | . , , , . . | | |  |
| 8 | 4/2001 .. | | | " " | | | He, Ne, Ar, Kr, Xe, Rn , . . 70 , 8- . | | |  |
| 9 | 4/2001 .. | | | "-" | | | , , . | | |  |
| 10 | 4/2001 .. | | | " " | | | - , . : . . | | |  |
| 11 | 4/2001 .. | | | " " | | | . . ? - . | | |  |
| 12 | 4/2001 .. | | | " " | | | . . | | |  |
| 13 | 4/2001 .. | | | " " | | | , , . , . . | | |  |
| 14 | 4/2001 .. | | | " " | | | : , , , . , , , . | | |  |
| 15 | 4/2001 .. | | | " " | | | , , 103-105 , , , . : , , . | | |  |
| 16 | 4/2001 .. | | | " " | | | . . | | |  |
| 17 | 4/2001 .. | | | " -" | | | , , , . , , . | | |  |
| 18 | 4/2001 .. | | | " " | | | . | | |  |
| 19 | 4/2001 .. | | | " " | | | . , . . . . | | |  |
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