search query: @keyword billing / total: 25
references: 24-25 / 25
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| title | year | author | ||
| 24. | 1996 | Tuomikangas, Jyri |
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| 25. | 1994 | Jaakkola, Pia |
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INSSI
| title | year | author | ||
| 24. | 1996 | Tuomikangas, Jyri |
||
| 25. | 1994 | Jaakkola, Pia |