|  |  | - | $9.99
| $10.00 | 2h 17m | |
| Database Survey & Theoretical Articles
| | 1 | $7.50
| $3.65 | 3h 58m | |
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| $7.00 | 16h 33m | |
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| $2.99 | 1d 01h 31m | |
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| $6.00 | 20h 07m | |
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| $11.00 | 16h 51m | |
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| | | 1 | $1.99
| $3.00 | 16h 58m | |
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| $5.99 | 21h 16m | |
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| $11.00 | 1d 02h 59m | |
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| $11.00 | 16h 51m | |
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| Calculate | 1d 04h 47m | |
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| $3.50 | 2d 02h 28m | |
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| $3.00 | 1d 19h 18m | |
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| $4.49 | 2h 35m | |
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| $3.50 | 2d 02h 30m | |
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