Cyclic variations of quasar brightness as a function of ln/1 + z/

Cyclic Variations of T-Tauri Stars

Cyclic variations of the Be star beta 1 Monocerotis.

Cyclic variations of the calcium network in solar polar regions.

Cyclic variations of the light of R CR B and their connection with the nonperiodic fadings of the brightness

Cyclic Variations of the Light of R-Coronae and Their Connection with the Nonperiodic Fadings of the Brightness

Cyclical behaviour and disc truncation in the Be/X-ray binary A0535+26

Cyclical Behaviour in Early Universe Cosmologies

Cyclical period changes in HT Cas: a clear difference between systems above and below the period gap

Cyclical Period Changes in Short-Period Dwarf Novae

Cyclical period changes in the dwarf novae V2051 Oph and V4140 Sgr

Cyclical period changes in Z Chamaeleontis

Cyclical Spectral and Photometric Variations of the Apparently Single Wolf-Rayet Star WR 134

Cyclical Variability of Prominences, CMEs and Flares

Cyclical Variation of the Quiet Corona and Coronal Holes

Cyclical variations of the density and coronal temperature

Cyclicities in the light variations of LBVs. I. The multi-periodic behaviour of the LBV candidate ζ^1^ Sco.

Cyclicities in the light variations of S Doradus stars III. P Cygni

Cyclicity and NRM acquisition in the Armantes section (Miocene, Spain): Potential for an astronomical polarity time scale for the continental record

Cyclicity in Terrestrial Upheavals during the Phanerozoic Eon