Form 10-Q June 30, 2019

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-20190630.xml XBRL TAXONOMY EXTENSION SCHEMA zgsi-20190630.xsd XBRL TAXONOMY EXTENSION CALCULATION LINKBASE zgsi-20190630_cal.xml XBRL TAXONOMY EXTENSION DEFINITION LINKBASE zgsi-20190630_def.xml XBRL…