NA Waser, K Yin, Z Yu, K Tada, PJ Harrison, DH Turpin, SE Calvert,
Nitrogen isotope fractionation during nitrate, ammonium and urea uptake by marine diatoms and coccolithophores under various conditions of N availability Marine Ecology Progress Series. ,vol. 169, pp. 29- 41 ,(1998) ,
10.3354/MEPS169029