Chebyshev Approximation for Nonrecursive Digital Filters with Linear Phase, Thomas W. Parks and James H. McClellan (1972), IEEE Transactions on Circuit Theory, Vol. CT-19, no. 2, pp. 184-194.
A Unified Approach to the Design of Optimum Linear Phase FIR Digital Filters, James H. McClellan and Thomas W. Parks (1973), IEEE Transactions on Circuit Theory, Vol. CT-20, No. 6, pp. 697-701.
A Program for the Design of Linear Phase Finite Impulse Response Digital Filters, Thomas W. Parks and James H. McClellan (1972), IEEE Transactions on Audio and Electroacoustics, Vol. AU-20 no. 3, pp. 195-199.
Equiripple FRI Design