1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C
1987SoPh..111...31C