Karapetyants, Alexey N. <br/><br/>
L-characteristic of some potential type operators with osci-llating symbols and singularities of the Kernels on a spher-e / by Alexey N. Karapetyants and Vladimir A. Nogin 

 - México : tamento de Matemáticas 
 - 11 p. 
 - Reporte interno ; 243 / Instituto Politécnico Nacional, CIN-VESTAV, Departamento de Matemáticas .