9SOVA V, SZUASI J.Applieation of industrial auto focusing in the purification of lysine[J]. Study Biophys, 1987,119(13) :207 - 209.
10BORUCH M, MAKOWSKI J,WACHOUICZ M. Ion exchange processes in separadon of nitrogen compounds from potato juice[J]. Technol Chem, 1990,561 (44) : 37 - 48.