Fuchs F, Chadelle M, Captier G, Prodhomme O, Faure JM.
Solitary Median Maxillary Central Incisor due to Nasal Pyriform Aperture Stenosis in Fetus: The First Prenatal Ultrasound Case Report. 
Int J Clin Pediatr Dent
2020;
13
(3):295-298.