FREUND, J., KELLNER, R., KONVALINKA, J., WOLBER, V., KRÄUSSLICH, H. G., KALBITZER, H. R. A Possible Regulation of Negative Factor (Nef) Activity of Human Immunodeficiency Virus Type 1 by the Viral Protease. European Journal of Biochemistry. 1994, 223(2), 589-593. ISSN 0014-2956.