search query: @keyword billing / total: 25
references: 22-25 / 25
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| title | year | author | ||
| 22. | 1998 | Isomäki, Markus |
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| 23. | 1998 | Ikäläinen, Kirsi |
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| 24. | 1996 | Tuomikangas, Jyri |
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| 25. | 1994 | Jaakkola, Pia |
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