The first kind periodic solutions of differential equations of the second order
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| Format: | Article |
| Language: | Slovak English |
| PhysicalDescription: | Res. rus., angl., lit. 13 zázn. v slov., ruš., angl., tal. |
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| Physical Description: | Res. rus., angl., lit. 13 zázn. v slov., ruš., angl., tal. |
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