Shared Leadership is a complex phenomeon that has gained attraction recently in both scientific and practitioner oriented literature, as examplified by a number of articles. Since the level of abstraction is important to the reader, I have separated the knowledge into two areas.
If you are interested in a scientific perspective on shared leadership, take a look at this brief summary of shared leadership for scientists. This also provides recommendations for further reading.
If you are interested in shared leadership from a practical standpoint, here you will find information on what shared leadership is and how companies can benefit from it.