Orapin Bhumibhamon, Udom Sittiphuprasert, Naiyana Boontaveeyuwat, and Jantana Praiboon, “The Optimum use of Salinity, Nitrate and Pond Depth for β-Carotene Production of Dunaliella salina”, Agr. Nat. Resour., vol. 37, no. 1, pp. 84–89, Mar. 2003.