  The Popescu-Gabriel theorem states that each Grothendieck abelian category is
a localization of a module category. In this paper, we prove an analogue where
Grothendieck abelian categories are replaced by triangulated categories which
are well generated (in the sense of Neeman) and algebraic (in the sense of
Keller). The role of module categories is played by derived categories of small
differential graded categories. An analogous result for topological
triangulated categories has recently been obtained by A. Heider.
