More recent examples include Courtines' Periodic Classification (1925), Wringley's Lamina System (1949),Giguère's Periodic helix (1965) and Dufour's Periodic Tree (1996).
Blandt nyere eksempler er Courtines' periodiske klassifikation (1925), Wringley's Lamina-system (1949),Giguère's Periodiske helix (1965) og Dufours periodiske træ (1996).