TY - `BOOK` PB - Norwegian Univ. Pr. CY - Oslo PY - 1987 LA - eng SE - 288 S. SN - 82-00-02580-2 SN - 82-00-02597-7 SN - 978-82-00-02597-9 SN - 978-82-00-02580-1 CN - 88 B 1030::1 AN - UBHD-3499180 ER -