1. Bello A. Kalayi G.D. Maitama H.Y. Mbibu N.H. Kalba D.U. Bladder calculus following an unusual vesical foreign body www.ajol.info http://ajol.info/index.php/jstcr/article/viewFile/55116/43589
2. Al-Ali S.M. Al-Kandari F.M. Al-Hamdan A.S. IUCD threads acting as uterine foreign body following removal of intrauterine contraceptive device www.kma.org http://www.kma.org.kw/KMJ/Issues/Dec2005/Case%20Report/50-04-IUCD%20Threads%20Acting.pdf
3. Vesicle calculus caused by migrant intrauterine device;Lu;AJR Am J Roentgenol,1999