Berestetskii, V.B. ... [et al.]  <br/><br/>
Quantum electrodynamics   : course of theoretical physics vol. 4  
Berestetskii, V.B. ... [et al.]  
 - 2nd ed.  
 -   Elsevier  1982 
<br/><br/><label>Dewey Class. No.: </label>530.12  / N82 BER.L