@article {IOPORT.00841629,
    author       = {Lee, Sin-Min and Lai, Kuen-Yu and Wang, Yon-Sian and Kiang, Min-Kuan},
    title        = {On the graceful permutation graphs conjecture.},
    year         = {1994},
    journal      = {Congressus Numerantium},
    volume       = {103},
    issn         = {0384-9864},
    pages        = {193-201},
    publisher    = {Utilitas Mathematica Publishing Inc., Winnipeg},
    abstract     = {Summary: In 1983 the first author conjectured that for any $n > 1$ and any permutation $f$ in $S(n)$ the permutation graph $P (P_nf)$ is graceful. Some families of graceful permutation graphs are exhibited here. We also propose a more general conjecture at the end of the paper.},
    identifier   = {00841629},
}