Please cite the pks package by the following reference:
Heller J, Wickelmaier F (2013). “Minimum discrepancy estimation in probabilistic knowledge structures.” Electronic Notes in Discrete Mathematics, 42, 49–56. doi:10.1016/j.endm.2013.05.145.
Corresponding BibTeX entry:
@Article{, title = {Minimum discrepancy estimation in probabilistic knowledge structures}, author = {J\"urgen Heller and Florian Wickelmaier}, journal = {Electronic Notes in Discrete Mathematics}, year = {2013}, volume = {42}, pages = {49--56}, doi = {10.1016/j.endm.2013.05.145}, }