1. Lamagna & Savage: Combinational Complexity of Some Monotone Functions, 15 th SWAT Conference, 1974
2. Mehlhorn: On the Complexity of Monotone Realizations of Matrix Multiplication, Univ.d. Saarlandes, TR 74-11, Sept. 1974
3. Paterson: Complexity of Monotone Network for Boolean Matrix Product, Univ. of Warwick, TR 2, July 1974.
4. Pratt: The Power of Negative Thinking in Multiplying Boolean Matrices, 6 th SIGACT Conference, 1974.
5. Schnorr: Lower Bounds on the Complexity of Monotone Networks, unpublished memo.