1. Herbert, T. T.: Precipitation of plant virus by polyethyleneglycol.—Phytophatology53: 362, 1963.
2. Jermoljev, E., Albrechtová, L.: Stabilization of purified potato virus X by dextrane T-10 during lyophilization.—Biol. Plant. in press 1969.
3. Lindner, R. C., Kirkpatrick, H. C., Weeks, T. E.: Some factors affecting the purification of a stone fruit virus.—Phytopathology45: 574–576, 1955.
4. Mundry, K. W., Rohmer, I. Über die mechanische Übertragung des Vergilbungsvirus der Rüben. —Phytopath. Z.31: 305–318, 1958.