Approved IFCC recommendations on whole blood sampling, transport and storage for simultaneous determination of pH, blood gases and electrolytes - Burnett, RW; Covington, AK; Fogh-Andersen, N; Külpmann, WR; Maas, AH; Müller-Plathe, O; Siggaard-Andersen, O; Van Kessel, AL; Wimberley, PD; Willem, G; Zijlstra, WG (Eur J Clin Chem Clin Biochem, 1995)