(NtRUDY PO FIZIKE (B/s - (NkRAWEC(B, (NtORI^AN pAWLOWI^s; (NgOSUDARSTWENNYJ OPTI^ESKIJ INSTITUT aKADEMII nAUK sssrs ((NmOSKWA (B;s (NlENINGRAD (B:s (Nb(B/(Ni(B,s, 1959)
Keywords: (NfIZIKAs