KQQKQP and KQPKQP≈. - Peter Karrer (J. Int. Comput. Games Assoc., 2000)

3-5-Man Chess: Maximals and Mzugs. - G. McC. Haworth; Peter Karrer; J. A. Tamplin; Christoph Wirth (J. Int. Comput. Games Assoc., 2001)