Yasuji Okita
- Study On Clogging Criterion For Gravel Drain. Dans: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1991, n. 439 (décembre 1991). (1991):
- Effect Of Soil Densification Applying The Gravel Drain System With A Compaction Rod. Dans: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1992, n. 444 (mars 1992). (1992):