Utkus A, Kazakevicius R, Ptasekas R, Kucinskas V, Beckwith JB, Opitz JM (June 2001). "Human anotocephaly (aprosopus, acrania-synotia) in the Vilnius anatomical collection". American Journal of Medical Genetics. 101 (2): 163–171. doi:10.1002/ajmg.1320. PMID11391661.
Utkus A, Kazakevicius R, Ptasekas R, Kucinskas V, Beckwith JB, Opitz JM (June 2001). "Human anotocephaly (aprosopus, acrania-synotia) in the Vilnius anatomical collection". American Journal of Medical Genetics. 101 (2): 163–171. doi:10.1002/ajmg.1320. PMID11391661.