TY - JOUR AU - Bachmann, O. PY - 1981 DA - 1900/01/01 TI - On rank 4 projective planes SP - 364361 VL - 4 AB - SN - 0161-1712 UR - https://doi.org/10.1155/S0161171281000185 DO - 10.1155/S0161171281000185 JF - International Journal of Mathematics and Mathematical Sciences PB - Hindawi Publishing Corporation KW - ER -