", "Nature" 396:321-322* Yu DW, Shepard GH (1999) "The mystery of female beauty", "Nature" 399:216* Yu DW, Proulx SM, Shepard GH (2008) "Masculinity, marriage, and the paradox of the lek", In: Swami V, Furnham A (eds) "The Body Beautiful", Palgrave Macmillan, New York, pp 88–107==External links==*Machiguenga at Native Planet*Machiguenga at Shinai* Matsigenka* Allen Johnson: Matsigenka Research
", "Nature" 396:321-322* Yu DW, Shepard GH (1999) "The mystery of female beauty", "Nature" 399:216* Yu DW, Proulx SM, Shepard GH (2008) "Masculinity, marriage, and the paradox of the lek", In: Swami V, Furnham A (eds) "The Body Beautiful", Palgrave Macmillan, New York, pp 88–107* Machiguenga* Machiguenga at Native Planet* Machiguenga at Shinai* Living With the Machigenga