Some scholars have observed the relationship between the Fenhe river group ,the sub-dialect of the Zhongyuan Mandarin dialect, and the northwest Chinese dialect in Song dynasty, and they have many articles and works about this topic.

The Change of Dong Sheng Wei in the Confrontation Between Ming and North Yuan in Hongwu Period;

Emperor Zhaozong of the North Yuan dynasty did come to Helin after he evacuated from Yuanchang, and made Helin his capital—— the spirit pillar and the political center for him to restore the Great Yuan dynasty.

Political situation of Northern Yuan as reflected in Bei Xun Si Ji (Journal of an Inspection Tour in the North);

The Diplomatic Relations Between Northern Yuan and Korea : 1368年- 1369年;

The Rise of Daibei Landlords and Tang Dynasty