Jumean, F.H. 2010. “Thermodynamics of the Second Ionization of Piperazine- N,N&Acute; -Bis(2-Ethanesulfonic Acid) in Water and in Aqueous Methanol”. Asian Journal of Chemistry 4 (3):579-87. https://asianpubs.org/index.php/ajchem/article/view/25099.