Cliff Richard | Goddard Space Flight Center | Jimmy Cliff | Goddard College | Cliff Robertson | Oak Cliff | Tom Goddard | Cliff Thorburn | Cliff Morgan | Cliff Michelmore | Cliff Curtis | Tony Cliff | Henry H. Goddard | Cliff Lee | Cliff Bastin | Cliff | Red Cliff | Mark Goddard | John Goddard | Goddard Lieberson | Cliff Stearns | Cliff Friend | Cliff Bleszinski | cliff | Red Cliff Air Station | Pliny Earle Goddard | Gary Goddard | Cliff Swain | Cliff Slaughter | Cliff Politte |
The leading proponents of the theory are Anna Wierzbicka at Warsaw University and later at the Australian National University who originated the theory in the early 1970s (Wierzbicka 1972), and Cliff Goddard at Australia's Griffith University (Goddard & Wierzbicka 1994, 2002).