this should be a fairly authoritive source :
Encyclopædia Britannica Article
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also spelled liter unit of volume in the metric system, equal to one cubic decimetre (0.001 cubic metre). From 1901 to 1964 the litre was defined as the volume of one kilogram of pure water at 4 °C (39.2 °F) and standard atmospheric pressure; in 1964 the original, present value was reinstated. One litre is equivalent to approximately 1.0567 U.S. quart.
since in german it's also LITER , i'll go with that :wink:
(if i used LITRE in canada , people would think i'm coming from quebec