Chiu, Chih-Yung, et al. “Peripheral Hypoechoic Spaces in Consolidated Lung: A Specific Diagnostic Sonographic Finding for Necrotizing Pneumonia in Children”. The Turkish Journal of Pediatrics, vol. 50, no. 1, Feb. 2008, pp. 58-62, https://doi.org/10.24953/turkjpediatr.2008.2381.