Shilun lishi de "chongyan" yu lishixue de "yuyan Genghua Zhang In: "Shixue Lilun Yanjiu". Pp 5-14. 1997 2 substantive philosophy of history future/prediction historical change
Lishi shi renlei de cunzai fangshi Zhen Han In: "Shixue Lilun Yanjiu". Pp 5-13. 1995 2 substantive philosophy of history existentialism future/prediction