中国科学院数学与系统科学研究院期刊网
The Characteristic Boundary Value Problems for Hyperbolic Equations in Commutative Quaternion Algebra
Bi Wen YANG(1); Man Li LI(2);
Acta Mathematica Sinica, Chinese Series . 2007, (6): 1249 -125 .  DOI: 10.12386/A2007sxxb0147