TY  - SER
TI  - Transactions of the national academy of science and technology: volume 13
SN  - 01158848
PY  - 1991///
CY  - Taguig, Metro Manila
PB  - The National Academy of Science and Technology
KW  - Mathematical sciences
KW  - sears
KW  - Physical engineering sciences
N1  - Includes bibliographical references
ER  -