code: public java.util.List<SecurityGroupReference> getSecurityGroupReferenceSet() {
          if (securityGroupReferenceSet == null) {
              securityGroupReferenceSet = new com.amazonaws.internal.SdkInternalList<SecurityGroupReference>();
          }
          return securityGroupReferenceSet;
      }
docs: <p>
  Information about the VPCs with the referencing security groups.
  </p>
  
  @return Information about the VPCs with the referencing security groups.