O. Le Bon, L. Staner, G. Hoffmann, M. Dramaix, I. San Sebastian, J.R. Murphy, M. Kentos, I. Pelc, P. Linkowski,
The first-night effect may last more than one night. Journal of Psychiatric Research. ,vol. 35, pp. 165- 172 ,(2001) ,
10.1016/S0022-3956(01)00019-X