Olympic lifts

In 1998 I wrote, published and claimed copyright on this concept (bolding added now):

Olympic lifts : the Olympic lifts (cleans, snatches and variations of these) are excellent and universally popular exercises for the development of explosive power

I was conducting research and I came upon the following exercise in a publication copyright claimed by another 'author' at a subsequent date (bolding added):

For the explosive athlete I am a big believer in the Olympic lifts and their variations for power development.

And I said to myself: “That looks familiar!” So I cross-referenced it and I said to myself: “Wow! No wonder that looked familiar!”

And I came upon this wording another one more times by the same 'author' in different publications - in the absence of credits or references to the origin or permission to use from the original author (myself), and that the 'author' claimed copyright....