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Accounts receivable (Tables) | 6 Months Ended
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Jun. 30, 2021
Accounts receivable |
Schedule of accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |
​ | ​ | 2021 | ​ | 2020 | ​
Accounts receivable |  | 5,002 |  | 5,043 | ​
Expected credit loss | ​ | (48) | ​ | (50) | ​
​ |  | 4,954 |  | 4,993 | ​
​ | ​ | ​ | ​ | ​ | ​
Revenue related to the steel sector — % | ​ | 89.27 | % | 87.25 | %
Schedule of impairment of accounts receivables recorded in income statement | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three-month period ended June 30, | ​ | Six-month period ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Impairment of accounts receivable recorded in the income statement | ​ | 3 | ​ | (3) | ​ | 2 | ​ | 9

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