Beckman-Sundh U., Ek B., Zetterqvist Örjan and Ek P. 2011. A screening method for phosphohistidine phosphatase 1 activity. Upsala Journal of Medical Sciences. 116, 3 (Jun. 2011), 161–168. DOI:https://doi.org/10.3109/03009734.2011.585253.