[dealers Association launched self-discipline investigation on Bohai Securities, Guohai Securities and other financial institutions] Financial Associated Press, May 31 (Xinhua)-- the Dealers Association found in the investigation of illegal "self-financing" of debt financing instruments Northern International Trust Co., Ltd., China overseas Quirong Asset Management Group Co., Ltd., Great Wall Guorui Securities Co., Ltd., Bohai Securities Co., Ltd., Guolian Securities Co., Ltd., Guorong Securities Co., Ltd., Guohai Securities Co., Ltd. is suspected of violating the rules in the issuance and trading of related debt financing instruments. In accordance with the rules on self-discipline in the interbank bond market, the Dealers Association launched a self-discipline investigation on seven institutions.