1. Lerbs, H W An Approximate Theory of Heavily Loaded Free Running Propellers in the Optimum Condition Transactions of the Society of Naval Architects and Marine Engineers Vol 58 1950pp137183
2. Lerbs H W Moderately Loaded Propellers with a Finite Number of Blades and an Arbitrary Distribution of Circulation Transactions of The Society of Naval Architects and Marine Engineers Vol 60 1952 pp 73 123