To cite the LPmerge package in publications use:

Endelman, JB, and C Plomion. 2014. LPmerge: an R package for merging genetic maps by linear programming. Bioinformatics 30:1623-1624.

Corresponding BibTeX entry:

  @Article{,
    title = {LPmerge: an R package for merging genetic maps by linear
      programming},
    author = {J. B. Endelman and C. Plomion},
    year = {2014},
    journal = {Bioinformatics},
    volume = {30},
    pages = {1623-1624},
  }