I.P.E.T.y M. N° 99. ROSARIO VERA PEÑALOZA Córdoba,
cordoba 99CORDOBA FM 99.9 ... Radio OnThe Kakeya Maximal Function and the Spherical Summation Multipliers Author(s): Antonio Cordoba Source: American Journal of Mathematics, Vol. 99, No. 1 (Feb., 1977), pp. 1-22