Petrich, M., and Gerhard, J.A.. "All varieties of orthogroups.." Semigroup forum 31 (1985): 311-352. <http://eudml.org/doc/134757>.
@article{Petrich1985, author = {Petrich, M., Gerhard, J.A.}, journal = {Semigroup forum}, keywords = {union of groups; idempotents; regular orthogroup; fully invariant congruences; subdirect decompositions; bases for the identities; subvarieties}, pages = {311-352}, title = {All varieties of orthogroups.}, url = {http://eudml.org/doc/134757}, volume = {31}, year = {1985}, }
TY - JOUR AU - Petrich, M. AU - Gerhard, J.A. TI - All varieties of orthogroups. JO - Semigroup forum PY - 1985 VL - 31 SP - 311 EP - 352 KW - union of groups; idempotents; regular orthogroup; fully invariant congruences; subdirect decompositions; bases for the identities; subvarieties UR - http://eudml.org/doc/134757 ER -
