Question: The Triangle of reference was a book published by what was often referred to as what?
Sentence (from "Tidal stream generator"): A tidal stream generator, often referred to as a tidal energy converter (TEC), is a machine that extracts energy from moving masses of water, in particular tides, although the term is often used in reference to machines designed to extract energy from run of river or tidal estuarine sites.
Relevant evidence: No