Are the circular, dark features on Comet Borrelly's surface albedo variations or pits?

@article{citeulike:44520, author = {Nelson, R. M. and Soderblom, L. A. and Hapke, B. W. }, citeulike-article-id = {44520}, doi = {http://dx.doi.org/10.1016/j.icarus.2003.04.002\%20}, issn = {0019-1035}, journal = {Icarus}, month = {January}, number = {1}, pages = {37--44}, posted-at = {2004-12-28 17:26:26}, publisher = {Elsevier}, title = {Are the circular, dark features on Comet Borrelly's surface albedo variations or pits?}, url = {http://dx.doi.org/10.1016/j.icarus.2003.04.002\%20}, volume = {167}, year = {2004} }

TY - JOUR ID - citeulike:44520 L3 - citeulike-article-id:44520 IS - 1 JF - Icarus SN - 0019-1035 EP - 44 TI - Are the circular, dark features on Comet Borrelly's surface albedo variations or pits? PB - Elsevier VL - 167 SP - 37 AU - Nelson, RM AU - Soderblom, LA AU - Hapke, BW PY - 2004/01// UR - http://dx.doi.org/10.1016/j.icarus.2003.04.002%20 ER -