Novak, V. J. A. (1955) „The Question of the Gradient-factor and its Function in Insect Metamorphosis. Observations to H. E. Hinton‘s paper: The initiation, maintenance, and rupture of diapause: A new theory (The Entomologist, 86, 279-291, 1953)“., Beiträge zur Entomologie = Contributions to Entomology, 5(5-6), S. 457–461. doi: 10.21248/contrib.entomol.5.5-6.457-461.