Markowsky, G.. "Ordering D-classes and computing Schein rank is hard.." Semigroup forum 44.3 (1992): 373-375. <http://eudml.org/doc/135161>.
@article{Markowsky1992, author = {Markowsky, G.}, journal = {Semigroup forum}, keywords = {semigroup of binary relations; principal ideal; NP-complete; Schein rank; binary matrix; rectangular binary relation; Boolean sum}, number = {3}, pages = {373-375}, title = {Ordering D-classes and computing Schein rank is hard.}, url = {http://eudml.org/doc/135161}, volume = {44}, year = {1992}, }
TY - JOUR AU - Markowsky, G. TI - Ordering D-classes and computing Schein rank is hard. JO - Semigroup forum PY - 1992 VL - 44 IS - 3 SP - 373 EP - 375 KW - semigroup of binary relations; principal ideal; NP-complete; Schein rank; binary matrix; rectangular binary relation; Boolean sum UR - http://eudml.org/doc/135161 ER -
