Kim H, Son J, Yoo H, Kim H, Oh J, Han D, Hwang Y, Kaang B.  Effects of the Female Estrous Cycle on the Sexual Behaviors and Ultrasonic Vocalizations of Male C57BL/6 and Autistic BTBR T+ tf/J Mice.  Exp Neurobiol 2016;25:156-162.  https://doi.org/10.5607/en.2016.25.4.156