XBRL Files To download, simply click the link to display the source page, and then right-click and Save As. Note: These files are meant to be read with appropriate reader applications. Description Document XBRL INSTANCE DOCUMENT zgsi-20190331.xml XBRL TAXONOMY EXTENSION SCHEMA zgsi-20190331.xsd XBRL TAXONOMY EXTENSION CALCULATION LINKBASE zgsi-20190331_cal.xml XBRL TAXONOMY EXTENSION DEFINITION LINKBASE zgsi-20190331_def.xml…
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