<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">MacQueen, J. </hi>1967. "Classification and analysis of multivariate observations." In: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)italic">5th Berkeley Symp. Math. Statist. Probability</hi> <hi xmlns="http://www.tei-c.org/ns/1.0" rend="color(#000000)">. S. 281–297.</hi>