The van der Waals interaction
Journal or Book Title
AMERICAN JOURNAL OF PHYSICS
The interaction between two neutral but polarizable systems at separation R, usually called the van der Waals force, is discussed from different points of view. The change in character from 1/R6 to 1/R7 due to retardation is explained.
Holstein, BR, "The van der Waals interaction" (2001). Physics Department Faculty Publication Series. 309.