A Composite Color-Magnitude Diagram for a Number of Very Poor Clusterings in the Milky Way
Lars Olof Lodén · Symposium - International Astronomical Union · 1984
There are indications of the presence of numerous stellar clusterings in the Milky Way which are so poor and unconspicuous that they become detected merely by accident. The true frequency of such objects is probably considerable as there is reason to believe that only a minor fraction has been detected.