Research report.

no.1539-1555; no.1673-1681 1685-1686; no.1178-1183 1973-1975; no.1185-1196 1975-1978; no.1197-1207 1978-1979; no.1208-1218 1979; no.1279,1282-1287 1976-1978,1980; no.1219-1221,1223-1226,1228-1231,1233-1234 1979-1980; no.1248-1263 1980; no.1264-1268,1270-1271,1278 1980; no.1288,1290,1292,1295,1298,1301 1979-1981; no.1303-1304,1308,1312,1314,1324 1980-1981; no.1350,1354,1356,1359-1360,1367,1370,1376,1380 1983-1984; no.1382-1383,1393-1394,1397,1408,1411-1412,1419 1984-1986; no.1421-1422,1424,1426-1430,1465 1986,1988; no.1469,1472-1473,1475,1477,1482-1483 1988; no.1486-1488,1495-1497,1499,1503 1988; no.1527,1529-1531,1533-1537 1989; no.1556-1571 1990; no.1572-1579 1990; no.1580-1585 1991; no.1587-1595 1991; no.1598-1607 1991; no.1608-1632 1992; no.1641-1656 1993; no.1657-1664 1994; no.1673-1686 1995; no.1688-1699 1996; no.1701-1705 1996; no.1707-1719 1997; no.1720-1725 1998; no.1727-1733 1998; no.1734-1740 1999; no.1742-1745 1999; no.1746-1751 1999; no.1752-1757 2000; no.1758-1764 2000; no.1766-1775 2001; no.1776-1785 2001; no.1786,1788-1793(2002); no.1797-1800(2002); no.1801-1809(2003); no.1810-1815(2003); no.1816-1819(2004); no.1820-1823(2004); no.1824-1828,1830(2004); no.1834-1838(2005); no.1839-1844(2005); no.1777(2001)