“…Here k 𝑝,𝑠 is the 𝑠th positive zero of 𝐽 𝑝 -the derivative of the Bessel function 𝐽 𝑝 with integer or half-integer 𝑝 ≥ 0 (again our notation differs from that in [14] for 𝑚 = 0). The twenty initial values in the increasing order are as follows: k1/2,1 = 1.1655..., k1,1 = 1.8411..., k3/2,1 = 2.4605..., k2,1 = 3.0542..., k5/2,1 = 3.6327..., k0,1 = 3.8317..., k3,1 = 4.2011..., k1/2,2 = 4.6042..., k7/2,1 = 4.7621..., k4,1 = 5.3175..., k1,2 = 5.3314..., k9/2,1 = 5.8684..., k3/2,2 = 6.0292..., k5,1 = 6.4156..., k2,2 = 6.7061..., k11/2,1 = 6.9597..., k0,2 = 7.0155..., k5/2,2 = 7.3670..., k6,1 = 7.5012..., k1/2,3 = 7.7898... (18) It should be noted that 𝑘 1,1 -the first value in (10) -coincides with k1,1 which is second here, whereas the eighth value in (10) is only fifteenth here. It is clear that every eigenvalue k2 𝑚/2,𝑠 with even 𝑚 is also an eigenvalue of problem ( 8), but for eigenvalues with odd 𝑚 this is not true.…”