Error message

Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Notice: Trying to access array offset on value of type int in element_children() (line 6595 of /var/www/html/default/includes/common.inc).
Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /var/www/html/default/includes/common.inc).
Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in menu_set_active_trail() (line 2405 of /var/www/html/default/includes/menu.inc).

Photon emission at molecular resolution induced by a scanning tunneling microscope

Berndt, R. R. J. K. B. R. R. W. D. M. et al. Photon emission at molecular resolution induced by a scanning tunneling microscope. Science 262, 1425–1427 (1993).