XBRL Files
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| Description | Document |
|---|---|
| XBRL INSTANCE DOCUMENT | zgsi-20181231.xml |
| XBRL TAXONOMY EXTENSION SCHEMA | zgsi-20181231.xsd |
| XBRL TAXONOMY EXTENSION CALCULATION LINKBASE | zgsi-20181231_cal.xml |
| XBRL TAXONOMY EXTENSION DEFINITION LINKBASE | zgsi-20181231_def.xml |
| XBRL TAXONOMY EXTENSION LABEL LINKBASE | zgsi-20181231_lab.xml |
| XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE | zgsi-20181231_pre.xml |
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