Variational approach for segmentation of lung nodules. - Amal A. Farag; Hossam E. Abdelmunim; James H. Graham; Aly A. Farag; Salwa Elshazly; Sabry El-Mogy; Mohamed S. El-Mogy; Robert Falk; Sahar Al-Jafary; Hani Mahdi 001; Rebecca Milam (ICIP, 2011)