Sever, Z., & Mendelssohn, H. (1988). Copulation as a possible mechanism to maintain monogamy in porcupines, Hystrix indica.. Animal Behaviour, 36(5), 1541–1542. https://doi.org/10.1016/S0003-3472(88)80225-2
Copulation of Indaan crested Porcupine
Sever-Copulation as a possible mechanism to maintain monogamy in porcupines-1988