In Bessel polynomials Grosswald studies: the relationship between Bessel functions and Bessel polynomials, differential equations and differential recurrence relations satisfied by the generalized Bessel polynomials, recurrence relations satisfied by the generalized Bessel polynomials, orthogonality properties of the generalized Bessel polynomials and the corresponding moment problem, relations of the generalized Bessel polynomials and the classical orthogonal polynomials, generating functions, Rodrigues -type formulas, the generalized Bessel polynomials and continued fractions, the zeros of the Bessel polynomials, algebraic properties of the Bessel polynomials, and the Galois group of the Bessel polynomials.
Sa Bessel polynomials Grosswald pag-aaral: ang relasyon sa pagitan ng Bessel function at Bessel polynomials, kaugalian equation at kaugalian pagbalik relasyon nasiyahan sa pamamagitan ng pangkalahatan Bessel polynomials, pagbalik relasyon nasiyahan sa pamamagitan ng pangkalahatan Bessel polynomials, orthogonality pag-aari ng pangkalahatan Bessel polynomials at ang nararapat na sandali ng problema, relasyon ng pangkalahatan Bessel polynomials at ang klasiko orthogonal polynomials, pagbuo ng mga pag-andar, Rodrigues-uri ng mga formula, sa pangkalahatan Bessel polynomials at patuloy na fractions, ang zero ng Bessel polynomials, algebraic pag-aari ng Bessel polynomials, at ang Galois grupo ng Bessel polynomials .