Reference for Eruvin 161:15

רב פפא אמר ההיא צלויה בצואת האדם הואי דכתיב (יחזקאל ד, יב) והיא בגללי צאת האדם תעגנה לעיניהם

Was it not, however, taught that no 'erub may be prepared with it? - This is no contradiction since the latter refers to one whose joints are recognizable while the former deals with one whose joints are unnoticeable. R'Zera citing Samuel ruled: An 'erub may be prepared with rice bread or with millet bread.

Jastrow