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"Magnetic properties of (Nd,Y)₂Fe₁₄B and (Nd,Gd)2Fe₁₄B", Z. D. Zhang, Y. K . Huang, X. K. Sun, Y. C. Chuang, F. R. de Boer and R. J. Radwański, Journal of the Less Common Metals 152 (1989) 67

"High-field magnetization of Pr₂Fe₁₄B-based compounds", Z. D. Zhang, Y. K . Huang, X. K. Sun, Y. C. Chuang, F. M. Yang, F. R. de Boer and R. J. Radwański, Physica B-Condensed Matter 155 (1989) 269