1. Gaseous hydrogen assisted crack growth in 18 nickel maraging steels
2. R. P. Gangloff and R. P. Wei, accepted for publication in Met. Trans. A (1977).
3. Hydrogen enhanced crack growth in 18 Ni maraging steels
4. G. W. Simmons, P. S. Pao and R. P. Wei, Lehigh University, Bethlehem, Pennsylvania, unpublished research (1977).