Citroën GS Birotor,
http://imcdb.org/vehicle_927850-Citroen-GS-Birotor-GZ-1974.html
test version made with a rotary motor
https://en.wikipedia.org/wiki/Citro%C3%ABn_GS#GS_Birotor
not many of the already very few survived, Citroën tried to by them back to make that version disappear to avoid providing spare parts

Before that, the engine has been tested in the Citroën M35, a special coupé version of the Ami made just for testing purposes:
http://imcdb.org/vehicles_make-Citro%EBn_model-M35.html
https://en.wikipedia.org/wiki/Citro%C3%ABn_M35

And still about Citroën, that special version of the BX:
http://imcdb.org/vehicle_83405-Citroen-BX-4TC-1986.html