We discuss apparent and real 1/f^δ divergencies in the small-frequency limit of power spectra of dynamical systems. Apparent 1/f² divergencies appear in ``type-I'' intermittency and whenever there is infrequent random hopping between regions with chaotic motion. Real 1/f^δ divergencies appear in ``types-II and -III'' intermittency. The universal properties of these divergencies are discussed in the context of one- and two-dimensional maps.
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Ben-Mizrachi et al. (1985) studied this question.