Hilgert, Joachim, and K. H. Hofmann. “Lie Semialgebras Are Real Phenomena.” Math. Ann., vol. 270, 1985, pp. 97–103.
LibreCat: /record/51460

Hilgert, Joachim, and K. H. Hofmann. “Old and New on SL(2).” Manuscripta Math., vol. 54, 1985, pp. 17–52.
LibreCat: /record/51459