:

  •  
                                                          

    - (-

    - (-

    , , ), [-CH2-CH=CH-CH2-]n - [-CH2-CH(CN)-]m, , . - ( , .).

    (Williams) (1883-1962)
    ( . 1931)
    (1906-71)
    (Berlage) (1856-1934)
    ( . auscultatio - )
    :