5
Acknowledgments
One of us (AK) acknowledges support from the National Research
Council under the Resident Research Associateship program at the
Jet Propulsion Laboratory, California Institute of Technology and
from Max-Planck-Institut für Gravitationsphysik. We would like to
thank Dr. Michele Vallisneri for preparing the figure. This
research was in part funded by the Polish KBN Grant No. 1
P03B 029 27.