共 19 条
[11]
SCHMIDT WA, 1950, Patent No. 2527379
[12]
SCHMIDT WA, 1949, Patent No. 2486440
[13]
TULAGIN V, 1947, Patent No. 2414491
[15]
WILMANNS G, 1940, Patent No. 2186849
[16]
1901, Patent No. 120345
[17]
1928, BEILSTEINS HDB, V11, P74
[18]
1950, Patent No. 2522802
[19]
1950, Patent No. 2536010