Exploring Hyperbolic Geometry with The Geometer's Sketchpad by Dwyer, Marlene C., Pfiefer, Richard E.

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The Historical Development of J. J. Sylvester's Four Point Problem by Pfiefer, Richard E.

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Maximum and minimum sets for some geometric mean values by Pfiefer, Richard E.

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Circles, Vectors, and Linear Algebra by Pfiefer, Richard E., Van Hook, Cathleen

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70.42 The Density of Pythagorean Rationals by Pfiefer, Richard E.

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Surface area inequalities for ellipsoids using Minkowski sums by Pfiefer, RichardE

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Problems and Solutions by Pan, Yi-chuan, Tiu, Philip D., Valdinoci, Enrico, Far, Habib Y., Zhou, Li, Holshouser, Arthur L., Parmenter, Michael, Sastry, K. R. S., Pfiefer, Richard E., Tong, Zengxiang, Delany, Jim, Nelsen, Roger B., Seaman, William, Zerger, Monte J., Malm, Eric

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Problems and Solutions by Pan, Yi-chuan, Tiu, Philip D., Valdinoci, Enrico, Far, Habib Y., Zhou, Li, Holshouser, Arthur L., Parmenter, Michael, Sastry, K. R. S., Pfiefer, Richard E., Tong, Zengxiang, Delany, Jim, Nelsen, Roger B., Seaman, William, Zerger, Monte J., Malm, Eric

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Self-Circumference in the Minkowski Plane by Ghandehari, Mostafa, Pfiefer, Richard

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The Historical Development of J. J. Sylvester's Four Point Problem by Pfiefer, Richard E.

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E3217 by Pfiefer, Richard E., Holshouser, A. L., King, L. R., Klein, B. G.

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Elementary Problems: E3213-E3218 by Bloom, D. M., Zhang, Guo Qiang, Cseh, Laszlo, Merenyi, Imre, Froemke, Jon, Grossman, Jerrold W., Pfiefer, Richard E., Egerland, W. O.

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Circles, Vectors, and Linear Algebra by Pfiefer, Richard E., Van Hook, Cathleen

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Problems by Michael, T. S., Wardlaw, William P., Grossman, Jerrold W., Gülicher, Herbert, Gilbert, George T., Chappell, Glenn G., Sheeran, Frank, Tamvakis, Harry, Morris, Howard Cary, Agnew, Robert A., Bencze, Mihály, Foss, Matt, Galperin, Gregory, Gauchman, Hillel, Falkowitz, Mordechai, Woo, Peter Y., McGarry, Vince, Pfiefer, Richard E., Boase, Mansur, Solvers, TAMUK Problem

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Problems by Mocanu, Mirel, Binz, J. C., Wardlaw, William P., Fukuta, Jiro, Van Velsir, Gary L., Klamkin, Murray S., Rhemtulla, A. H., Ladas, Gerry, Schaumberger, Norman, Pîrvǎnescu, Florin S., Holzsager, Richard, Callan, David, Sadoveanu, Ioan, Doucette, Robert L., Barry, Frances, MacHale, Desmond, Borchers, Brian, Wei, Wan-Di, Pfiefer, Richard E.

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Problems by Bulman-Fleming, Syd, Heuer, Gerald A., Bang, Seung-Jin, Covas, Miguel Amengual, Northshield, Sam, Klamkin, Murray S., Morris, Howard, Poonen, Bjorn, Handelsman, Michael, Straffin, Philip D., Martin, Reiner, Wardlaw, William P., Fukuta, Jiro, Pfiefer, Richard, Stolarsky, Kenneth, Riese, Adam, Kedlaya, Kiran S.

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Problems by Graham, Ronald L., Hill, Murray, Loseke, Keith, Metzger, Jerry M., Chilaka, James O., Meyer, W. Weston, Klamkin, Murray S., Smarandache, Florentin, Schwenk, Allen J., Bivens, Irl C., Doster, David, Hill, Chris, Shallit, Jeffrey, Koster, David W., Shapiro, Daniel B., Konečný, Václav, Heuver, J., Pfiefer, Richard E., Bencze, Mihály, Shafer, Robert E.

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Problems by Reznick, Bruce, Grossman, Jerrold W., Hoyt, John P., Wardlaw, William P., Rabinowitz, Stanley, Klamkin, M. S., Poonen, Bjorn, Feuerman, Martin, DeAlba, Luz M., Bolla, Mike, Kalman, Dan, Bennett, John O., Frame, J. S., Groenman, J. T., Smeenk, D. J., Pfiefer, Richard E., Newcomb, William A., Shafer, Robert E., Bracken, Paul, Nelsen, Roger B., Powers, R. Glenn, Rosenholtz, Ira, Bencze, Mihaly

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Problems by Feuerman, Martin, Groenman, J. T., Smeenk, D. J., Shafer, Robert E., Rosenholtz, Ira, Bencze, Mihály, Klamkin, M. S., Hoyt, John P., Olk, Bill, Zai-ming, Zhang, Demir, Hüseyin, Mascioni, Vania D., Powell, Barry, Finn, Michael V., Frohliger, John A., Hernández, Víctor, Joshi, Padmini T., Parmenter, Michael M., Pfiefer, Richard E., Poonen, Bjorn, Soderkvist, Jan, Wagner, Carl, Rassias, Themistocles M., Hernandez, Victor, Newcomb, William A., Rosenblatt, J., Shapiro, Daniel B.

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