@article{Konacki:2009,
author
=
"M.Konacki and A.Maciejewski and A.Wolszczan",
title
=
"Improved timing formula for the PSR B1257 + 12 planetary system",
journal
=
"Astrophysical Journal",
number
=
"no 544",
pages
=
"921--926",
year
=
"2000",
}