:

  •  
                                                          

    . 1- . . . - 1- . 1- . . . , 3 . . . , 4 . - . 7 . . . 19 - . 20 . ( . 1930- . . ).

    (Abell) (1901-61)



    (Bordet) (1870 - 1961)
    :