  In a recent paper Ozdogan (Z. Naturforsch, 59a(2004)743) published formulas
for evaluating the two-center overlap and nuclear attraction integrals over
integer and noninteger Slater type orbitals. The purpose of this article is to
point out that the same formulas have previously been established by Guseinov
et al. (J.Mol.Model.,8(2002)272) by using the same method. As we demonstrated
in our Comment (Int.J.Quantum Chem., 91(2003)62), the expansion formula for the
product of two normalized associated Legendre functions in elliptical
coordinates and the expansion coefficients presented by Ozdogan are obtained
from the use of given in our papers general formulas (I.I.Guseinov,
J.Phys.,B,3(1970)1399; Phys.Rev.,A,32(1985)1864; J.Mol.Struct
(Theochem),336(1995)17) by changing the summation indices. It should be noted
that the published by Ozdogan results are on the use of formulas for the
evaluation of multicenter integrals presented in his other papers, which are
also obtained from the literature (see, e.g., C.C.J. Roothaan, J.Chem.Phys., 19
(1951) 1445; A.Lofthus, Mol. Phys., 5 (1962) 105) and our articles by changing
the summation indices (see Comments: I.I.Guseinov, Commun.Theor.Phys., 38
(2002) 256; Int.J.Quantum Chem., 91 (2003) 62; J.Math.Chem., 36 (2004) 123;
J.Chin.Chem.Soc., 51 (2004) 877; J. Chin. Chem. Soc., 51 (2004) 1077;
I.I.Guseinov, B.A.Mamedov, Can.J.Phys., 82(2004) 205, p.206).
