During the past month, both the reference sites "Research Gate" and "Academia" informed me that my paper "Nonzero Sum Differential Games" and related Nash Equillibria articles published in the early 1970s were referenced by a group of recent papers published all over the world. Thus, I can add to my collection of works  that has made the "50 years of being continuously referenced" mark. My prediction in an early article has come true https://blog.sciencenet.cn/blog-1565-1302122.html  .