A class of solvable Lie groups and their relation to the canonical formalism Hans Tilgner — 1970 Annales de l'I.H.P. Physique théorique
A spectrum generating nilpotent group for the relativistic free particle Hans Tilgner — 1970 Annales de l'I.H.P. Physique théorique
A class of Lie and Jordan algebras realized by means of the canonical commutation relations Hans Tilgner — 1971 Annales de l'I.H.P. Physique théorique