Nga, Tran Thi Viet, Nguyen Phuc Duong, and Than Duc Hien. 2012. “Enhancement of Magnetic Properties of La-Substituted Strontium Hexaferrite Particles Prepared by Sol-Gel Route”. Communications in Physics 20 (2):137. https://doi.org/10.15625/0868-3166/20/2/2167.