Algebraic Logic and Universal Algebra in Computer Science, edited with R. Maddux and D. Pigozzi, Lecture Notes in Computer Science, vol. 425, New York, Springer-Verlag, 1990.
Papers
Semilattice Sums of Algebras and Mal'tsev Products of Varieties, with T. Penza and A. Romanowska, Algebra Universalis, 81, 33 (2020). https://doi.org/10.1007/s00012-020-00656-8. pdf
Here are some additional notes addressing possible generalizations of the main theorem.
Introducing Boolean semilattices, in "Don Pigozzi on Abstract Algebraic Logic and Universal Algebra," Springer-Verlag, pdf
Automorphism-primal algebras generate verbose varieties, Algebra Universalis, vol. 74 (2015), 117-122. pdf DOI 10.1007/s00012-015-0337-0.
Commutative, idempotent groupoids and the constraint satisfaction problem, with David Failing, Algebra Universalis, vol. 73, no. 3-4 (2015), 391-417. AU versioncomplete manuscript, with appendix DOI 10.1007/s00012-015-0323-6.
Measuring bias in cyclic random walks, with S. Sethuraman, Missouri J. Math., 25 (2013), 195-212. pdf
Fully invariant and verbal congruence relations, with J. Berman, Algebra Universalis, 70 (2013), 71-94. pdf
An automatic, time-based, secure pairing protocol for passive RFID, with G. Amariucai and Y. Guan, Workshop on RFID Security--RFIDSec'11 (Amherst, MA, USA) June 2011. pdf
An artificial neural network for wavelet steganalysis, with J. Davidson and E. Bartlett, Optics and Photonics, Mathematical Methods in Pattern and Image Analysis, vol 5916, SPIE, 2005, 1-10. pdf
Unitary embedding for data hiding with the SVD, with J. Davidson, Security, Steganography and Watermarking of Multimedia Contents VII, SPIE, 2005. pdf
Computational complexity of generators and nongenerators in algebra, with G. Slutzki, Int. J. Algebra and Computation, 12 no. 5, (2002), 719-735. pdf
Computational complexity of some problems involving congruences on algebras, with G. Slutzki, Theoret. Comp. Sci., 270 (2002), 591-608. pdf.
Extended abstract in Fifteenth Annual IEEE Symposium on Logic in Computer Science (LICS 15) IEEE Computer Society, 2000, 168-174.
Complexity of some problems concerning varieties and quasivarieties of algebras, with G. Slutzki, SIAM J. Computing, 30 no. 2 (2000), 359-382. pdf
Extended abstract in 16th Symposium on Theoretical Aspects of Computer Science (STACS '99), Lecture Notes in Computer Science, v. 1563, Springer-Verlag, 1999, 163-172.
Computational complexity of term-equivalence, with G. Slutzki, Int. J. Algebra and Computation, 9 no. 1,(1999), 113-128. pdf
Categorical equivalence of modes, with J. Berman, Discussiones Mathematicae, 19 (1999), 41-62. pdf
Algorithms for categorical equivalence, with J. Berman, Math. Struc. Comp. Sci., 8 (1998), 1-15. pdf
Categorical equivalence of algebras with a majority term, Algebra Universalis, 40 (1998), 149-175. pdf
Morita equivalence of almost-primal clones, with J. Berman, J. Pure Appl. Algebra, 108 (1996), 175-201. pdf
Subquasivarieties of regularized varieties, with A. Romanowska, Algebra Universalis, 36 (1996), 536-563. pdf
Structural completeness in algebra and logic, Algebraic Logic (H. Andreka, D. Monk, and I. Nemeti, eds.) pdf
Minimal varieties and quasivarieties, with R. McKenzie, J. Australian Math. Soc., Series A 48 (1990), 133-147. pdf
Non-axiomatizability of the amalgamation class of modular lattice varieties, Order, 6 (1989), 49-58. pdf
Residually small modular varieties with AP, Houston J. Math., 14 (1988), 451-464. pdf
On the relationship of AP, RS, and CEP in congruence modular varieties, II, with R. McKenzie, Proc. AMS, 103 (1988), 335-343. pdf
Saturated algebras in filtral varieties, Algebra Universalis, 24 (1987), 101-110. pdf
On the relationship of AP, RS, and CEP in modular varieties, Algebra Universalis, 22 (1986), 164-171. pdf
Amalgamation classes of some distributive varieties, Algebra Universalis, 20 (1985), 143-166. pdf
Deductive varieties of modules and related objects, with L. Hogben, Trans. AMS, 289 (1985), 303-320. pdf
The amalgamation class of a discriminator variety is finitely axiomatizable, Universal Algebra and Lattice Theory (R. Freese and O. Garcia, eds.) Springer-Verlag, New York, 1983. Lecture Notes in Mathematics, vol. 1004, 1-9. pdf
How to cancel a linearly ordered exponent, with R. McKenzie and Zs. Nagy, Colloquia Mathematica Societatis Janos Bolyai, 29. North-Holland Publishing Co., Amsterdam, 1977, 87-93. pdf