@misc{Trust,
	Author = {S. Kramer and R. Gor\'{e} and E. Okamoto},
	Howpublished = {{L}ogic {C}olumn of {ACM} {SIGACT} {N}ews},
	Month = {March},
	Title = {Formal Definitions and Complexity Results for Trust Relations and Trust Domains fit for {TTP}s, the {Web} of {Trust}, {PKI}s, and {ID}-{Based} {C}ryptography},
	Url = {\url{https://doi.acm.org/10.1145/1753171.1753193}},
	Year = {2010}}