Jon, F <br/><br/>
Ploskie volny i sfericheskie srednie  v primenenii k differentsial'nym uravneniiam s chastnymi proizvodnymi 
F. Jon; trad. din lb. engleza: N. D. Vvedenskoj 
 - Moskva  Izdatel'stvo inostrannoj lit  1958 
 - 158 p  ill  22 cm 
<br/><br/> Cuprinde bibliografie si index  Scriere chirilica  Plane waves and spherical means applied to partial differential equations - Fritz John (New York - Interscience publishers; London - Interscience publishers)