Incubation effects

Dominowski, R. L., & Jenrick, R. (1972). Effects of hints and interpolated activity on solution of an insight problem. Psychonomic Science, 26, 335–338.

Gall, M., & Mendelsohn, G. A. (1967). Effects of facilitating techniques and subject-experimenter interaction on creative problem solving. Journal of Personality & Social Psychology, 5, 211–216.

Olton, R. M. (1979). Experimental studies of incubation: Searching for the elusive. Journal of Creative Behavior, 13, 9–22.

Olton, R. M., & Johnson, D. M. (1976). Mechanisms of incubation in creative problem solving. American Journal of Psychology, 89, 617–630.