From the text of the article: "Jamnitzer’s studies possess a captivating artistic merit. With the manipulation, repetition, and layering of basic shapes, they seem like distant precursors to Minimalism and its concerns."

'60 Minimalism in sculpture, that is. e.g. Tony Smith, or Gego.

To be honest, the author seems to be talking more about a more recent idea of minimal sculpture, like polyhedra made out of wire. A google image search for "minimal geometric sculpture" (no quotes in the search) will show a lot of that work.