“…However, unlike the widely developed theory of zeros of Bessel functions , , and corresponding cylinder functions (see, e.g., the surveys [7,11,19] and references therein), significantly less inequalities and asymptotic results are known for zeros of , . Among known ones, the inequality of McCann [14, (10)] reads as , ≥ √︂ 2 0, + 2 2 , (1.1) and the following approximation of , for a fixed of McMahon [15, (24)] (see also [5,Theorem,p. 583]) states that…”