An elementary approach to certain bilinear estimates
  We prove L2 x L2 to weak L1 estimates for some novel bilinear maximal operators of Kakeya and lacunary type thus extending to this setting, the works of Cordoba and of Nagel, Stein and Wainger. 
Jose A. Barrionuevo, Jarod Hart and Lucas Oliveira
math.CA math.FA