Natasha Tigreros and Paul V. Switzer. "Observations of Multiple Mating Under Field Conditions for Japanese Beetles (Popillia japonica Newman) (Coleoptera: Scarabaeidae)" Journal of the Kansas Entomological Society Vol. 82 Iss. 2 (2009) p. 151 - 159
Available at: http://works.bepress.com/paul_switzer/59/