Mohammed, S., K. Kadhum, and K. Hameed. “Classical and Statistical Optimization of Medium Composition for Promoting Prodigiosin Produced by Local Isolate of Serratia Marcescens”. Al-Khwarizmi Engineering Journal, Vol. 14, no. 4, Dec. 2018, pp. 92-02, doi:10.22153/kej.2018.03.006.