Publications and articles: 

Bessonov, Nikolai: “Gypsies and the press, Epic of the Lyuli”

Cohn, Ronald & Russell, Jesse: “Lyuli”, 2012, VSD

Lom, Petr  "Synopsis of "The Kidnapped Bride", 2004, Frontline/World

Nazarov, Khol: “Contemporary Ethnic Development of the Central Asian Gypsies (Liuli)”, 1983, Soviet Anthropology and Archeology,  21 (3): 3-38.

The article “Lylli” in Wikipedia states that Lyuli are a subgroup of the Dom people (Asian Gypsys) living in Central Asia, primarily Tajikistan, Uzbekistan and Kyrgyzstan.