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| 0001140361-19-006323-index.html | 2019-04-02 16:22:48 | |
| 0001140361-19-006323.txt | 2019-04-02 16:22:48 | |
 0001140361-19-006323-xbrl.zip | 168590 | 2019-04-02 16:22:48 |
| bstc-20181231.xml | 1441242 | 2019-04-02 16:22:48 |
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| ex4_6.htm | 18748 | 2019-04-02 16:22:48 |
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| Financial_Report.xlsx | 75442 | 2019-04-02 16:22:48 |
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| report.css | 2767 | 2019-04-02 16:22:48 |
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