1. On the roots of the Bessel and certain related functions;Mcmahon, James;Ann. of Math.,1894
2. A. Kalähne, “Über die Wurzeln einiger Zylinderfunktionen und gewisser aus ihnen gebildeter Gleichungen,” Z. Math. Phys., v. 54, 1907, p. 55-86. Some of the results of this reference are given by Jahnke & Emde [10 (Sect. VIII)].
3. On a new method of computing the roots of Bessel’s functions;Marshall, William;Ann. of Math. (2),1910
4. Concerning the roots of 𝐽_{𝑛′}(𝑥)𝑁_{𝑛′}(𝑘𝑥)-𝐽_{𝑛′}(𝑘𝑥)𝑁_{𝑛′}(𝑥)=0;Truell, Rohn;J. Appl. Phys.,1943
5. Graphs and formulas for zeros of cross product Bessel functions;Kirkham, Don;J. Math. and Phys.,1958