¥Hausmann
(1982): -1, 0, +1
¥Vines
(2000), Jolliffe, Uddin & Vines (2002): more integers – gives so- called simple components
¥Chipman
& Gu (2004): find ordinary EOFs, then truncate
to –1, 0, +1 or –c1, 0, c2
¥Rousson
& Gasser (2004): a technique that produces blocks
of zeros and blocks of equal non-zero loadings