1. Steiner T (2002) Angew Chem Int Ed 41:48
2. Pauling L (1960) The nature of the chemical bond, 3rd edn. Cornell University Press, Ithaca, New York
3. Desiraju GR, Steiner T (1999) The weak hydrogen bond in structural chemistry and biology. Oxford University Press, New York
4. Kalir A, Kalir HH (1996) Chem Organophosphorus Compd 4:767
5. Hudson HR, Pianka M (1996) Phosphorus Sulfur Silicon Relat Elem 109(1):345