%0 Journal Article %J Verh. Internat. Verein. Limnol. %D 1978 %T Nitrate uptake in phytoplankton: Measurements utilizing the radioisotope, N-13 %A Gersberg, R %A Axler, R P %A Krohn, K %A Peek, N %A Goldman, C R %P 388-392 %V 20