Period doubling in Kepler RR Lyrae stars
Period switching in the symbiotic star BX Mon
Period Variations of Delta Scuti Stars
Period-Color and Amplitude-Color Relations in Classical Cepheid Variables - VI. New Challenges for Pulsation Models
Period-Luminosity Relation for Type II Cepheids
Period-Luminosity Relations For Magellanic Clouds Cepheids Based on OGLE-III Data: A Comparison
Period-Luminosity Relations for Small Magellanic Cloud Cepheid Based on AKARI Archival Data
Period-Luminosity Relations for Type II Cepheids and their Application
Period-luminosity relations of pulsating M giants in the solar neighbourhood and the Magellanic Clouds
Period-Magnitude relation of Mira-like variables in the Large Magellanic Cloud as a tool to understand circumstellar extinction
Periodic magnetorotational dynamo action as a prototype of nonlinear magnetic field generation in shear flows
Periodic mass loss episodes due to an oscillation mode with variable amplitude in the hot supergiant HD50064
Periodic Radio Emission from the M7 Dwarf 2MASS J13142039+1320011: Implications for the Magnetic Field Topology
Periodic Variability of Low-Mass Stars in SDSS Stripe 82
Periodic variable stars in CoRoT field LRa02 observed with BEST II
Periodicities in sunspot activity during solar cycle 23
Periodicities in the coronal rotation and sunspot numbers
Periodicities in the occurrence of solar coronal mass ejections
Perpendicular Ion Heating by Low-Frequency Alfven-Wave Turbulence in the Solar Wind
Persistent Magnetic Wreaths in a Rapidly Rotating Sun