Using ISOPHOT maps at 100 and 200 \mu m and raster scans at 100 , 120 , 150 and 200 \mu m we have detected four unresolved far-infrared sources in the high latitude molecular cloud L 183 .
Two of the sources are identified with 1.3 mm continuum sources found by Ward-Thompson et al .
( [ 1994 ] , [ 2000 ] ) and are located near the temperature minimum and the coincident column density maximum of dust distribution .
For these two sources , the ISO observations have enabled us to derive temperatures ( \sim 8.3 K ) and masses ( \sim 1.4 and 2.4 M _ { \sun } ) .
They are found to have masses greater than or comparable to their virial masses and are thus expected to undergo gravitational collapse .
We classify them as pre-protostellar sources .
The two new sources are good candidates for pre-protostellar sources or protostars within L 183 .